Malicious PDF — malware analysis report

Static analysis result for SHA-256 7505fcce252a074c…

MALICIOUS

PDF

83.0 KB Created: 2021-03-05 17:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e3625a388566388b3e26e8cc1069d125 SHA-1: e6c7532c15f14bf7f2230dd28986d6a5783a597d SHA-256: 7505fcce252a074cccbac551cbc7acdaba21856d95c7b8597736fb3cca6359a5
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 0.9993

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://seumenha.ru/strik?utm_term=captive+prince+trilogy+amazon PDF link annotation
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/9134487.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/RjfKtgd/lovix.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/a7t4sid/soccer_live_score_apk_download.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/07f1e.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/dkeiiyI/levutirubimulidikuto.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/guvazamaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5ff64ff4ca0ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5feb719e01209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6020fb65ac0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_603cef90448c2.pdfIn PDF document text
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/jagokezokezud.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WMtMXKd/extreme_bike_simulator_3d_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446492/normal_5ff85251552fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_7fcf21dc9ae345ea8be88ee55248aca9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a295f46-5b6c-485d-848a-9090412882d7/what_the_difference_between_mode_median_and_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cfa0b3-4b82-46e7-887f-b61541b77b69/how_much_do_international_business_graduates_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1431f9f2-ec8a-4181-a96e-5a72636686a9/what_should_blood_type_b_positive_eat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f53da0-d4d4-4409-b246-d2b37dd7a18e/list_of_jiu_jitsu_moves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95a2d1a-3480-4721-a5e8-6a783b0252be/belkin_n450_db_wifi_dual-band_n_router_review.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_6be58e727bfe4fc58f9dff5c028cc231.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6972f1dc-dcc5-4539-853e-d9acb9eff293/fatshark_dominator_v2_vs_v3.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_44edd8cfeb9d430bb84390fc0e10f6e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a29fb1-7384-4b3f-b5fa-40d57b7482b4/68737317192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2997c49e-efe4-4deb-9e69-162273ac1252/ranalevunizejagizarixa.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_abd46fd48d814327bcd059b4ff1d29a0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 5192 bytes
SHA-256: d255aaf7ebeeb70123a6ec1653e50af2999d6b92e5d0283daa8adad3f0eac9cc
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 11792 bytes
SHA-256: 8482c313c9bd8c92331e97174d0a6b4289d7ad81f738a6b3eedcf50ba3bec4ac