Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab35d74534852765…

MALICIOUS

PDF

67.7 KB Created: 2020-12-04 20:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed54bb225ed35317dfd8f24ad7b29333 SHA-1: 79681ecdc36cee560e2d1891e4dbef348b2cdfb4 SHA-256: ab35d74534852765581090464d7c0e68dab40c2bd0207dcef4595b4f0f41e4f5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=tc+helicon+duplicator+vocal+pedal
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/rogujelijixu.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5fa3d125b48ea.pdf
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/wisolumusavajavuvo.pdf
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/deredilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c338b52a-daa3-4017-95cd-c27b3a849a99/lorubised.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0fc5eaf37e3b64635368/1606291397809/kofeb.pdf
    • https://uploads.strikinglycdn.com/files/20f04b04-8393-4588-a848-6ef7d268a13e/dagofam.pdf
    • https://uploads.strikinglycdn.com/files/18afd465-394d-4e06-87ec-e81f11f806f8/sign_in_hotmail.com_msn.pdf
    • https://uploads.strikinglycdn.com/files/7f0ba9d2-20dd-4791-9739-03866a9f6dbb/67162288223.pdf
    • https://static1.squarespace.com/static/5fc4c837cd1e280355ed07ea/t/5fc5fabf3570fb44d1d061f2/1606810305143/xesabidoxigutaxo.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_off0000cb4c.bin
4c70f995f278edbc9c1af99a0767baa84636d4f773fd05a533b40f3f031dce64
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 4992 bytes
font_01_sfnt_off0000dc48.bin
98df6eee37b66639893cffab454c5fdc171ec6bbc5cf7c47d77a3527c72728e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 11128 bytes