Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41067557b2e82e4…

MALICIOUS

PDF

64.8 KB Created: 2020-11-10 18:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ffa9504243424df38da648cf102ef2 SHA-1: 770dd6b40f7ab7e1e2a926910a95079cb627f5a0 SHA-256: f41067557b2e82e424cee4f18aec717310eb33b9499228847a868b9318066c72
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external URIs, with the primary one being 'https://traffine.ru/aws?keyword=tu+me+cambiaste+la+vida+rio+roma+letra'. The presence of a link farm suggests an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://traffine.ru/aws?keyword=tu+me+cambiaste+la+vida+rio+roma+letra
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/20da2ba5946fb7.pdf
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fa3cc53a3e51.pdf
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f98a27a66642.pdf
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5f974300687d7.pdf
    • https://jumozavuna.weebly.com/uploads/1/3/4/5/134598597/ropizen-feraxawofe.pdf
    • https://kopezemab.weebly.com/uploads/1/3/4/3/134339977/6780616.pdf
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5fa353026bf3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/943cc3d4-5140-4857-b415-35701dad44bf/25757050857.pdf
    • https://uploads.strikinglycdn.com/files/e3fbedc3-7273-418a-b8ff-7962187ac383/ragiwaziro.pdf
    • https://uploads.strikinglycdn.com/files/03292fbf-4c98-4de7-ab69-b7ad6f81c9c6/vobavabikanenerupikodadun.pdf
    • https://uploads.strikinglycdn.com/files/8a87456e-38bf-4c56-81f5-aec32d2155e0/dowubatodawowefim.pdf
    • https://uploads.strikinglycdn.com/files/113f3ef9-ba63-4e79-bbc1-d5d71d3893c9/mit_early_decision_2020.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_off0000b950.bin
8fd621f3300c892bbb672939e5cc8fd631632fd9bde3cb7e5ebc4b898caf3fa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 5232 bytes
font_01_sfnt_off0000cb08.bin
6a49f080f35fd6e423b4ebd612060868d2118bc925386ae043499acd87cc391f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 14256 bytes