Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3da5786911d8f7…

MALICIOUS

PDF

73.0 KB Created: 2021-03-30 09:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 65f1992de085648b2cfa60b322f2cf68 SHA-1: a4b38f8226320d84609befc3f0489c2b85b5d699 SHA-256: 9f3da5786911d8f78aa0bb8f85b6fbfebb8c703d1bc9d348c1541fc7d5fcbfd6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://seumenha.ru/strik?utm_term=how+many+calories+are+in+wendy%2527s+4+piece+chicken+nuggets', appears to be a lure to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=how+many+calories+are+in+wendy%2527s+4+piece+chicken+nuggets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404750/normal_601f6c938e66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_6010d5d6d0295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5fe23ef416dd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5ff3c1f9d2166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fedbd759786e.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/nukomobagurebodujedo.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/3692297.pdfIn PDF document text
    • https://tijoramamuguko.weebly.com/uploads/1/3/5/3/135390581/rutenogaredixap-sunosek.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/kefugivefefopi_mabimurisop_teruzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_604d425f341af.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/8086618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_5fe743622fb02.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/9271640.pdfIn PDF document text
    • https://xugoxuxilolikat.weebly.com/uploads/1/3/4/8/134860817/xupumad.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/zisafafifurinomajeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369503/normal_5ffb5ba5c72d9.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/auditoria_libros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_605d7597c1723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_6057c1cad865c.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/what_does_a_husky_howl_mean.pdfIn PDF document text
    • http://wojisub.mypressonline.com/bsf_offline_form.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/614d8542-8f57-4ba3-a200-2a66d0848ff1/where_does_word_math_come_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5f667a-9867-4341-ac0d-c099f82dbd7c/beloved_complete_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8d9708-f2a3-4b64-b4bb-623f5f8d4afa/55037147525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42bcd92-da03-4ad9-b2fa-0df71c69c472/robin_williams_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a5f29c-742d-4a49-806b-39234527cfc1/kefupoleg.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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 5828 bytes
SHA-256: e5f05d506586dc629390219f07ef49714b37e6b45142ec89daa7f9b4160bd3bb
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10372 bytes
SHA-256: ca65a23d9aad808ee4225ccd3bd7f30f33868a08491becea8883cac475fb9db0

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