Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b65944ee3f6f904…

MALICIOUS

PDF

77.5 KB Created: 2021-04-11 09:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1b03b33bb94e8ef8423d73297baf80e6 SHA-1: 252d9d2c121c5116983102fd4adcd8134db7e65f SHA-256: 6b65944ee3f6f90446a17b5d48548155f164d32e74d839cbef193cbf17dea6e4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or phishing attempt. The primary URL, https://botokaw.ru/strik?utm_term=what+is+a+study+in+scarlet+about, is likely part of a lure to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=what+is+a+study+in+scarlet+about PDF link annotation
    • https://cdn.sqhk.co/xidatelo/je6jagd/57370810364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_5fcd505165bd0.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/heLVdjh/nhl_21_xbox_one_pre_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_6058c17766744.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/jgtkvge/tikfans_followers_fans_likes_from_tiktok._com.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/gitjfgc/8_ball_pool_miniclip_game_hack_key.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/in7hhia/59738618460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5fe40cb4efb23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5fdfc38db19f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_60089753b1fbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ee0d36-63be-4848-a2d0-488670670d58/19004366799.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_4d700fd72e1644348de65d9bb1101b8a.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_6462d50f8543431fbbc05b2c06cbe7e1.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_6ab01028e4d4471a903197f6e62b9365.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_d6ebc77a01a54d5cbee80b136f176b8e.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_32c7707a41954382be4c01edea2721b7.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_6385cd5e097b4388be43293e542b97f5.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3b4d63ea7e0b49bd85dd997648c79cd3.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_607151fd4eb3410a8dbba548cfe922c2.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_d39a0eea0bc2415ca6ea661c9dab593b.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_b4f3603d320f41fcbf50fb5202bfcca0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7b5ca7-10df-4a7f-b11d-cff06ccf0e47/arms_reach_co_sleeper_assembly_video.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_d31b4af419d0442a90f8cad539e04e06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5035bc2d-8abf-4628-a61f-46b833df640e/how_to_set_miter_saw_to_cut_crown_molding.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5280 bytes
SHA-256: ed0fac438a5627a5b4bd052d92fca77b0f02753b2712acddf53436fe5752796b
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10940 bytes
SHA-256: a3555cc42c9eacf1a4f23c4465e0888986e591f1e23c2f152bc60fdfa5c9cde9