Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9dae8ca4d25f71…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 03:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 787478ab81b764bc78287566237730e4 SHA-1: 21bc028c390cfa02d90676eaf0eac81c184a2efd SHA-256: 9c9dae8ca4d25f711628e8dbd04e3ae9ab87ab2f38b4a272ef1fcd5ce009ff74
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://jacksth.ru/strik?utm_term=boy+scout+bear+handbook+pdf, which is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=boy+scout+bear+handbook+pdf PDF link annotation
    • https://cdn.sqhk.co/wopeporamo/VihWugd/87387213348.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/hc9jeO3/super_mystery_dungeon_cave_of_the_deep.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/413f50b0-b64c-46ac-a66d-e58e0803c155/6287087082.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_83ae7b7fcdf24fb2817ebae0d652227d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef6d86f-ae2d-49e6-b7ff-578a163bcd70/kung_fu_wing_chun_full_movie_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07ff8dc-f8ed-4a29-a096-9cef1f897fe7/how_to_watch_twilight_on_amazon_prime.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_111bb5f70959424eb9fd8a792425f15b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/522da90e-bb98-4887-bc56-6b7aee0faa15/fisher_paykel_oven_parts_uk.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_b447e8349b0147fe85f17b4ca4374685.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_9ba98dafaf8f47c880ecb6c2351be849.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/921eaf81-d992-4a95-88e9-a72d9d013666/5081787026.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_de6c456bb2ac4e9dacb919306ff57a65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0bf60e-84aa-42cc-9990-4744eee1b478/gotakolasixizolumidudupa.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_c80235dcbbdc409eabfc1ebbfb0e5213.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a9bf9e-242d-4b2d-b6b9-70a6d2da60ce/dolumozuxezexegepukujav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62655917-f4f6-44f1-9b31-8374bb007131/48148845600.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_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 5564 bytes
SHA-256: 4d09c090a69471e69c4fbd6bb339822abe41f54448c9f9376455e845e70738a5
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 11416 bytes
SHA-256: 39c191fa9c804a665b51d2f8d229d4948bc7b254f36155fd3444335bb3ed84c6

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