Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22807231ffe7135…

MALICIOUS

PDF

136.8 KB Created: 2021-04-04 10:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 45ef20c2b868dfbdb5922e10dd750e06 SHA-1: c55371e1e05049993fa4719c076b53bcd2b85087 SHA-256: c22807231ffe7135230e776a2442ff7a85cfe1e0a3adaf5051237c06427cbf97
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/award?keyword=candombl%25C3%25A9+de+angola+fundamentos+pdf PDF link annotation
    • http://befujukipepejem.mygamesonline.org/voxafibezabanowenip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feb22b24637f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_60347e9c72b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602d025178fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_60035d90bb531.pdfIn PDF document text
    • http://vufajed.getenjoyment.net/wepixe.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/nQ4jgtK/bomebit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490128/normal_60392a3084894.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/b0ibnjd/face_mask_sign_images.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe0deb5b8d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_603b93f3728e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_6029e176c40cd.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/icecream_converter_to_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/igNtQgh/train_sim_world_2_bakerloo_line_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/ggW3hiL/ff7_remake_battle_arena_rewards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_603c1e4b7014f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_6057c1b36aa6d.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/bhhbij3/texas_renfest_camping_map.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/castration_cheval.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fc86bf3b2661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_e1ceb1f6054a4fdeaecb428aa01e76c0.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_9032f97aa75240358a4bd80615aa7617.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_7921d9ef8f04416893c486573661705c.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_38eb64a9019d40e095a9f0c44a061b9b.pdf?index=trueIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/blindspot_hidden_biases.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAC7 5404 bytes
SHA-256: fe39067a57f4dea3cea801c9056b12b78ffe0f4ffdc7c98df742ba6e6187cea2
font_01_sfnt_off0001dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCDE 13548 bytes
SHA-256: e659bb1baa7aa08e6d1b6bf59b9293da3433bf2fdc7cd3b120bc946dba5a294f
font_02_sfnt_off000204f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204F6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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