Malicious PDF — malware analysis report

Static analysis result for SHA-256 8150557014577c04…

MALICIOUS

PDF

77.2 KB Created: 2021-02-25 17:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e5411c4278740bf9b0b80f8b67ffd0e SHA-1: 824a7648734874ded6f7b48890d9e10fa4f4132f SHA-256: 8150557014577c0484b07b478f61f44d89b5d21ba91358e72c7e4810194ca8f2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=ap+english+3+study+guide PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/duMgjE4/brothers_in_arms_3_cheats_for_android_download.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/ce279c6824.pdfIn PDF document text
    • http://afracheat9.xyz/how_long_do_you_leave_beef_jerky_in_a_dehydratoru797r.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/w2Cjgjx/takeout_food_restaurants.pdfIn PDF document text
    • http://fufibubesex.iblogger.org/xipofufosekomovabe.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/TuT0tgc/dog_grooming_long-_haired_dachshund.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd128874e3b0.pdfIn PDF document text
    • https://cdn.sqhk.co/japivuwali/jciaJji/is_home_design_makeover_app_free.pdfIn PDF document text
    • http://wgathering.org/build_my_life_bethel_sheet_music2ftvm.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/Jii7VhC/hattrick_meaning_in_urdu.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/8631767.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/jhjdjcb/space_ranger_free_font.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/d4bd8ecd5.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/xotomas.pdfIn PDF document text
    • http://afracheat2.xyz/bleach_brave_souls_all_accessories_listw9wfm.pdfIn PDF document text
    • https://cdn.sqhk.co/zirimikuj/Rwp2aje/easy_wallet_apple_watch_sync.pdfIn PDF document text
    • http://petrol-v-pol-price.site/infinity_insurance_claims_department_phone_numberf8853.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/durujesonejijuzep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatojuwetowoj.rf.gd/2185811185.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/periodontitis_tratamiento.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/a-_f-_r-_o_album.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 5172 bytes
SHA-256: 1371b6e65aa93e355bbe58b19b4225d73fe3f10a95501be09f17f6e00d9d1ad8
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 10412 bytes
SHA-256: 7d6dbfd235e71fa37af6edae7c99e241d6b0da343bbd239466b10a2e73fff0e7