Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf93b9bbd845699c…

MALICIOUS

PDF

84.2 KB Created: 2021-03-28 14:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 021dcaa2323f936d19a7b6d0d3a7f531 SHA-1: 9f08aff1e3ffcd8e3776261bb1fc22e0350abc42 SHA-256: bf93b9bbd845699c73888b13045d746eafb5fb32c5a9136c71a3f3c840badd46
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://mezovuduw.ru/strik?utm_term=the+road+original+book+cover PDF link annotation
    • http://hocostyle.ru/far_cry_blood_dragon_achievement_guide9k0wq.pdfIn PDF document text
    • http://voiprormul.xyz/kevomuxotisokifcir.pdfIn PDF document text
    • http://badge-verification-center.com/cricket_game_information_downloadj3kns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5fdbec93e1144.pdfIn PDF document text
    • http://mebelintera.ru/37679635719pt3m0.pdfIn PDF document text
    • http://igonlinesupport.com/20638414349fw0lh.pdfIn PDF document text
    • http://bhd-management.space/majowqacpe.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/whajfhb/zodobi.pdfIn PDF document text
    • http://devlp.design/guruterojofewikekv6wh.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/pjdhgpO/86334349906.pdfIn PDF document text
    • http://hurricane1.space/brief_adherence_rating_scalejynyy.pdfIn PDF document text
    • http://cetakchantek.com/jibebodusononuzenosoimtsk.pdfIn PDF document text
    • https://cdn.sqhk.co/xolovagi/GFhTRhf/brain_test_2_tricky_stories_level_6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feeb1f8e6615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_5aa189b4d1b441c5baea2858482cb50b.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_2c8147480b234f15a459135a6d581106.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_bba37b9f1b744288aa71c773fcaccb8a.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_39631688fd21468d946b9f451be66a93.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_7aa4654334ad4e44820d105cc1b4c88b.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_ca63f589edf946689ca5ae955b58da7c.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_5b7b8720b2a04cd5ba3aea88b0204d84.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_04c05bf6fc9444bfb1e79f101745ce3c.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_432791c01f4c4318844a44792bd58069.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_0f3fee7a7b5b41faaf8f946d61df1cd6.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_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 5236 bytes
SHA-256: 38a9d95a3503aef52ae96c817807bc443f78e0542bdb6db7dda7f603fb8e8625
font_01_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 11120 bytes
SHA-256: 362d404f7739561e3e0f4b80441b02a6ed6da5d46152ab34207a28de45ca3f88