Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dfe37ad334fa69…

MALICIOUS

PDF

103.0 KB Created: 2021-03-27 18:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0d3295e78f8d9e3cfe6b51677358ffd0 SHA-1: 550fd8c42ba47b09b156cc215313a38e2efb616b SHA-256: 13dfe37ad334fa690eafd862e657dd7b3febec0ba03060678b52af06052dbdf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains or domains configured for SEO. The primary heuristic indicates a 'link farm' designed to distribute traffic across numerous external PDFs. While no scripts were extracted, the structure and numerous external URLs suggest a malicious intent to redirect users to potentially harmful content or for traffic monetization.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9794

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=more+than+average+meaning PDF link annotation
    • http://dominis.xyz/how_to_become_a_forklift_mechanic0pxlb.pdfIn PDF document text
    • http://wubufusimeveve.22web.org/kairosoft_bonbon_cakery_mod_apk.pdfIn PDF document text
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/4bf402.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/alternative_careers_in_science.pdfIn PDF document text
    • http://zekifafeter.scienceontheweb.net/types_of_blood_groups.pdfIn PDF document text
    • http://reduslimitaly-official.site/6648398228602pjd.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/96527068129.pdfIn PDF document text
    • http://trendmobile.ru/mechanical_engineering_average_salary_london2vqd6.pdfIn PDF document text
    • http://dkblogin-de.best/sales_follow_up_call_script_template0o9uk.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/ffb9ebccc3c.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/zuputesulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_a5a8352491614f02a3271478e8d28338.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_644ee680fb534514a142703c2f5e57bf.pdf?index=trueIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/open_country_sportsmans_kitchen_food_dehydrator_and_jerky_maker.pdfIn PDF document text
    • http://jajoditad.rf.gd/14597092869.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_5ffd611ac61c4a46a570e43a5a29a3a2.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_720719d082e04e81b8c9730242a3bb11.pdf?index=trueIn PDF document text
    • http://vogilidiniluti.rf.gd/tuvukas.pdfIn PDF document text
    • http://budobilososuw.rf.gd/89015284260.pdfIn PDF document text
    • http://romakilax.myartsonline.com/african_american_history_workbook.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_31f427b6299e4670be5f30bcf288243c.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_fed0cd9c9f4c4457bbdda647b8152d54.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_0f662512d67f434b93b75afcd53ddf2c.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_af534627795f4c97a76891580c703d6d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001607c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1607C 18176 bytes
SHA-256: 65d0e924153896c1b7b934558699ce6804b3861996bb96593d2dc5bc149281ef
font_00_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 5684 bytes
SHA-256: d3fbc2a6a4fefc37a8df4181ca695c97b565794bfcd4acc81fa050f6b49be61d
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 4956 bytes
SHA-256: 791c4abc06bc2952807043c487fcbe0c2b8f08e6e4dd4b862d11ced9270867d3
font_02_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 2656 bytes
SHA-256: a37cda85596f57e6059ac1f1313d2f33c9be92add6fb1ab1e12a556d9deccb5f
font_03_sfnt_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 2328 bytes
SHA-256: 45e304c212156e29fe3879e373e8c4d4eb7f7558b9b507d9aa917d89ddd5a3bf
font_04_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 2108 bytes
SHA-256: bbcb7bd70734be4a31c6bf9508418ed7110da018ae6e7a12fcb8c363b0124794
font_05_sfnt_off0001203e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 6640 bytes
SHA-256: c109aae36edda875fd35f15f31e7bb6a895eb8195fac0819136039d196d3ef6c
font_06_sfnt_off000131dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 15708 bytes
SHA-256: feb08a23e4af9ea08a78775def246db6deed973b808053681e24cb3bacfaf552
font_08_sfnt_off00017d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 3276 bytes
SHA-256: 379adbff4fd5162a8f290427eb02f808b8dbf03e384c40c5922da2d3f31055e9