Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c6c94da900747…

MALICIOUS

PDF

75.9 KB Created: 2020-11-17 18:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b568e663a8455983c7e4db39891d92c SHA-1: 580838783f0a33958ee6806e25dafa494c065fd5 SHA-256: 503c6c94da90074739fb3e2b09b3c6c155c78b11fd1f6e5ddf6f0828c73791df
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://traffine.ru/123?utm_term=round+table+pizza+chico', is likely part of this malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=round+table+pizza+chico
    • https://bolififona.weebly.com/uploads/1/3/4/3/134316640/aaeed25.pdf
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5fa1cc19235f8.pdf
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/5949227.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5faf4463cd9b8.pdf
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fa2397357fb3.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f952761d1ece.pdf
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/lezepasidixabazafe.pdf
    • https://cdn-cms.f-static.net/uploads/4408704/normal_5f9c2948e3472.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ae46a23c-69a2-4014-a777-7c84458ec35e/gepazulaxipuwivusi.pdf
    • https://uploads.strikinglycdn.com/files/dcd164b7-c89d-4cca-873f-e379ba4ed073/nirogabeboda.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/69821155437.pdf
    • https://uploads.strikinglycdn.com/files/0533af6c-2f4b-4cdb-966c-92aad4eb0b86/51083868334.pdf
    • https://uploads.strikinglycdn.com/files/ed66b977-e406-48f0-a1cf-8fce1f921bd7/saridazebi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c6.bin
dcfb2665c7f54bf0a795082e6f6a9dc4ebe212c3c475cda7db1e0f03d0e6ddb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 5084 bytes
font_01_sfnt_off0000da19.bin
8a9f918827789180e04a7df959e02ff8a71e0ae28a867368583793aacccaea0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10952 bytes
font_02_sfnt_off0000ff34.bin
3610b8eaa39125b52847332ef440cc36b2ac3174877a06d77d362d90a8ea52d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 20264 bytes