Malicious PDF — malware analysis report

Static analysis result for SHA-256 4577f45bce328853…

MALICIOUS

PDF

79.1 KB Created: 2021-03-08 03:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 76d70432e73f8effd9c7af9fc6d0d9a5 SHA-1: 384dc532b4f8b9f4da6051411567140319f96872 SHA-256: 4577f45bce32885345d46a1e12ebe8c2369cb4166cc59c083a72c8bde9fd1961
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being https://pelibifir.ru/wix?keyword=stephen+hawking+books+pdf+free. This suggests the document is part of a scheme to drive traffic to potentially malicious or ad-heavy websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/wix?keyword=stephen+hawking+books+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60273675de2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5fe63a072cd62.pdfIn PDF document text
    • https://cdn.sqhk.co/batitiviz/fibIshc/amazon_prime_video_roku.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/aUH2haR/29398429372.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/e6jjqIr/carpet_cleaner_home_depot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizedumi/my_cbse_guide_class_6_science.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/85361216461.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_e9454bc01b7b49a983e9535c7f51c0fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ebec9c-0470-4060-bb47-4bc0a71180a4/historia_de_una_escalera_analisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64db187-891e-4cfa-b7a4-67135782f90e/texik.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/17077341037.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/craftsman_6.75_hp_lawn_mower_manual.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_4a38b265192c4f9ca16e4dd693893299.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_c27a0f2f90114fe981530e5ec9a1a068.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_2bb6342cf1e040ae98fa1795f21219b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/nopazipas.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_2b480cc0f8ac42779af05ca0b2babba6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/528314163.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_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 5668 bytes
SHA-256: 17eb495be1c7e9f70ca28d19fcdfcf67d0075e503feeb60db482f99a9c682326
font_01_sfnt_off00010b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10552 bytes
SHA-256: 829084b8d01fb71c7d5cf0f769409cd199db490420dde356fbea907d54c18ed7

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