Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a35f631c7a9fc5e…

MALICIOUS

PDF

89.2 KB Created: 2020-12-18 09:42:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a3762a48ed3ca4d58a74356811c4d8e8 SHA-1: ed30bff297209adb016fac4254fc328c72b5727d SHA-256: 7a35f631c7a9fc5e7571114ccb43b94c2fbcc98a551649a88bbb30fcf0d1bcd0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'trafftec.ru'. Heuristics indicate a 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS', along with ClamAV detection as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata suggesting it's a manual for 'Lg 27ea63', likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=lg+27ea63+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f8de05d7b22d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5fc7f8c091ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5fbd106408b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fa10b8824018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fc940eba14c3.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/bufigabifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fd26ab2e96db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1b1e1c89e1c4b8fc407cc/t/5fc6e9200791337046d5a56c/1606871329780/strike_fighters_modern_combat_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc528f2abaecd33183df1a5/t/5fccb7c63ff1011540edef0f/1607251912279/jojo_siwa_coloring_book_printable.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0a7818e72e5fdb9e0d19/1606290044739/zombies_origins_staff_upgrade_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78a35778af068263f1171/t/5fc8b91db0f45b2a3d2c4435/1606990110862/ear_infection_symptoms_toddler_no_fever.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_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 5204 bytes
SHA-256: 99279d3428aeee2f273109af670bb40465fef7230b485e50facd10e8154b7930
font_01_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 11076 bytes
SHA-256: e2613a88aa3122903cdcf5f742de97c882dad39626f703392715c2f6d4386c04

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