Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bb6d93a5cbd79b…

MALICIOUS

PDF

80.9 KB Created: 2021-04-07 19:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17738d01c1c353fc589424732d38f6ed SHA-1: 13c4a205c2e0ab821043b71e2c558e320f857bf4 SHA-256: 56bb6d93a5cbd79bcbf311d9fb6660b32c23ae80b84068b52321441a8f427a39
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to multiple PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the PDF link farm suggest an attempt to direct users to malicious websites.

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://fokemale.ru/strik?utm_term=music+rhythm+exercises+online
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fe9b09542f81.pdf
    • http://creditreportus.info/73544036283cy5oy.pdf
    • https://static.s123-cdn-static.com/uploads/4501029/normal_6002819ab2f82.pdf
    • https://cdn-cms.f-static.net/uploads/4450145/normal_605a553b86ea3.pdf
    • http://gixitetopes.scienceontheweb.net/bamuw.pdf
    • http://gratoramm.website/73446758455u75s0.pdf
    • https://cdn-cms.f-static.net/uploads/4498882/normal_606a2fb38950b.pdf
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/xekejavogap.pdf
    • https://cdn-cms.f-static.net/uploads/4455208/normal_601ebf836892b.pdf
    • http://fovikoxesaweziz.medianewsonline.com/why_is_my_lawnmower_backfiring.pdf
    • http://alkim.xyz/11325995708v8ifh.pdf
    • https://cdn-cms.f-static.net/uploads/4459028/normal_6061ec434df60.pdf
    • https://cdn-cms.f-static.net/uploads/4479237/normal_602af61bd712f.pdf
    • http://marketes.pro/moxitubededopijizitodopqkq0.pdf
    • http://daddytestit.xyz/what_does_a_special_assistant_do017up.pdf
    • https://cdn-cms.f-static.net/uploads/4480904/normal_603e7340490d9.pdf
    • https://cdn-cms.f-static.net/uploads/4448551/normal_6051af6e55aef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jujobope.atwebpages.com/marketing_strategy_definition_by_authors.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_off0000fe62.bin
a4e693a77a4af2808458a894b55fdf58e3fd11b308156a0bd5f4bc9e4dc43303
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 5004 bytes
font_01_sfnt_off00010f56.bin
a12bfed03f6d16e7434ae56e7465e2920e15a96b86101d4b383403b6f8cf1527
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 10928 bytes