Malicious PDF — malware analysis report

Static analysis result for SHA-256 281f9e7ec4408555…

MALICIOUS

PDF

73.0 KB Created: 2021-01-01 04:21:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 81ad9931069029c2f1541802a81a90c3 SHA-1: 96d106fc924c7e1e5e82c74a0b98e4aab734085d SHA-256: 281f9e7ec44085550e158bb697e0d532e84744b2c1da614fca01045bd04d6f03
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF files, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://traffine.ru/strik?utm_term=malibu+boat+drive+shaft+seal', appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=malibu+boat+drive+shaft+seal PDF link annotation
    • https://doketilid.weebly.com/uploads/1/3/4/5/134529618/ab51a052307f.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/6728820.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/ibih1gg/ziwubekakidegok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fe09b6b047a6.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/1924c385e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5fcfaf5d95327.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/jo8gi01/skater_jeans_90s_mens.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/wilugugo/manorama_weekly_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/best_gba_emulator_for_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/whatsapp_free_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/37797521569.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/vumedugalifonokaroz.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 5200 bytes
SHA-256: ed5bf5c7c44dc7a24e109b57f0e1b0b7ac0f2cfad9246f9e7b668ce160ec5260
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10764 bytes
SHA-256: 38b42fd65c59eeeefb2dfd590e45d19d029d808f7ddb487a2c236e1d67687901

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