Malicious PDF — malware analysis report

Static analysis result for SHA-256 57318a8207138983…

MALICIOUS

PDF

66.9 KB Created: 2020-12-15 17:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a39dc834aefeea93de292d92a6dffe32 SHA-1: de70296a54b8eee7940581ea0823fc8a46645962 SHA-256: 57318a82071389832fac161043b2eb54bf0a6f9a4ac7da9ce29b0782f1600874
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to Weebly-hosted PDFs, suggests a link farm or redirection scheme. ClamAV also detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution tactics.

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://trafficel.ru/123?utm_term=mad+catz+rat+9+software
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/nomobiraxo.pdf
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/wizamilizedak-morozetamapokak-polumokimit.pdf
    • https://zenijubam.weebly.com/uploads/1/3/4/8/134884092/c955fa48b8def2f.pdf
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5fbdfebbaeb4e.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5fa54f6e112c4.pdf
    • https://cdn-cms.f-static.net/uploads/4501383/normal_5fbcce1689b12.pdf
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fd2c97480eb2.pdf
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/2948886.pdf
    • https://todijedesat.weebly.com/uploads/1/3/4/7/134775475/rofunifexowunuxiv.pdf
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8ffad1a87dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lefemijip/zivapuzodivawakikuruzubip.pdf
    • https://s3.amazonaws.com/waxegatulo/85931726763.pdf
    • https://s3.amazonaws.com/minegikukovel/12579229465.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0e9fb474932ca26a1687/1606225567581/usps_expects_item_for_mailing_ssk_meaning.pdf
    • https://s3.amazonaws.com/lukepepe/vertigo_movie_free_full.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_off0000c067.bin
1da1ecdc5a781760e5bc0b2d41b1f5ab27b12aab33102f2a4f3331f32e7afa51
pdf-font-stream PDF embedded font (sfnt) at offset 0xC067 5284 bytes
font_01_sfnt_off0000d298.bin
ee3699993d865f3ddb56378b8a82a71b873b62c6614c499eba71f63873d1c88f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 14196 bytes