Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916e7aaaff98c8f…

MALICIOUS

PDF

78.9 KB Created: 2021-05-13 05:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eb45dca222ec323dec5998e0526e385c SHA-1: 55529b70d483569d381af839a5e6e9f6e5ce16f5 SHA-256: 4916e7aaaff98c8f21b669b67d1590a6398e4ed0cfc910bc67f506ee38b63a59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=brother+hl+l2360dw+print+configuration+page PDF link annotation
    • http://mosdendy.store/92480536197s06lm.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/vGgfthf/lucky_coin_laundry_montclair_ca.pdfIn PDF document text
    • http://garderob-podolsk.ru/rirowejzojs.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/Yqjbjca/deer_hunter_classic_mod_apk_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/7Ky5uhj/best_hop_step_jumper_2k20.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/bIbDaHv/retro_city_rampage_dx_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/i3jfg0I/44229983860.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/Fhi2xjj/teacher_attendance_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/CcjB8id/gopro_live_stream_to_computer.pdfIn PDF document text
    • http://organic-ita.space/problemas_de_leyes_de_los_gases_ideales_resueltosgn3on.pdfIn PDF document text
    • http://futiwene.22web.org/how_to_get_youversion_bible_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sewenajete/mqiiw12/acrobat_software_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/4stu7jf/gavanojibiwimekororikun.pdfIn PDF document text
    • http://pek-24.cc/lagu_trio_elexis_anggur_merah_23j42e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/42795123105.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/11551233978.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/anthropological_theories_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/how_to_use_snow_whitening_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/necromunda_underhive_wars_next_gang.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_afa83403a2d449288805e132bdb01e15.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_6f6a2104f56140ae8d52a067bb75092a.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5852 bytes
SHA-256: 91a3ff6ab862cf91b6866bd1c78dad3c441c722511d15918383ff22fe43632fa
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 11376 bytes
SHA-256: bcdba665163ff4750bbefc639b141af6bf45783391e7fda5dc7d0c0696cc1a56
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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