Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e747f139f8ad5a…

MALICIOUS

PDF

77.1 KB Created: 2021-04-02 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d43c6383cce735909ef7b8a9dbabb04 SHA-1: 69b955b304f8c626a26674733e6318e077c487d5 SHA-256: 88e747f139f8ad5ab12db536eb0a6c04cec2b657f163173aa2ad1c1027bcf905
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=billboard+music+awards+2016+performances
    • https://cdn.sqhk.co/sozovifena/gidaiaN/tie_dye_party_kit_michaels.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_6043bea9ad0ad.pdf
    • https://cdn.sqhk.co/miwizawi/ihMja0s/92478059129.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6019b12489780.pdf
    • https://static.s123-cdn-static.com/uploads/4428052/normal_6000b2a4d2038.pdf
    • https://cdn.sqhk.co/rufomezin/e3txhhf/claim_missing_money_california.pdf
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5feec6e951da2.pdf
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fe8f9a5105ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_7fc0ae4e55624df0ae355c0ea30be508.pdf?index=true
    • https://s3.amazonaws.com/naxozelozude/ruxopezomuwegilamozuxu.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/how_to_drain_oil_from_craftsman_push_lawn_mower.pdf
    • https://s3.amazonaws.com/panalipolifod/45015714578.pdf
    • https://s3.amazonaws.com/xarojapi/wutowebag.pdf
    • https://s3.amazonaws.com/lonozote/gixepanufozuxadixebedag.pdf
    • https://s3.amazonaws.com/fajonubinomeder/43686347663.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_387df59914114a36997718fe64b4db22.pdf?index=true
    • https://s3.amazonaws.com/zupenafud/40343997732.pdf
    • https://s3.amazonaws.com/podawakumepewez/52277927489.pdf
    • https://s3.amazonaws.com/jepinebawo/c_programming_language_tutorial_youtube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb05.bin
15064fb6e78360bfda880893c308323707c83be7c9eee867a1e75e50628e30c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 6060 bytes
font_01_sfnt_off0000ffa5.bin
72d10bf4563c5cedbb28f4776e23a3016d84fd51068132b18bad1402e2434160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 11164 bytes

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