Malicious PDF — malware analysis report

Static analysis result for SHA-256 3318a4c4b74e1d59…

MALICIOUS

PDF

69.2 KB Created: 2020-12-07 16:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1a4c44cfa79f4fa83cd37064de7dc67a SHA-1: 520793ed49fc9bcf98316542bbf35b267199e49a SHA-256: 3318a4c4b74e1d59ccff34d10bc07ffd31f45b6a7074ba0e055282a9c7dbc874
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a URL that appears to be a lure for a book download. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of embedded URIs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=after+we+collided+full+book+online+pdf PDF link annotation
    • https://tevutilig.weebly.com/uploads/1/3/4/5/134585367/1870651.pdfIn PDF document text
    • https://jobozisibipiw.weebly.com/uploads/1/3/4/5/134581899/f8fe27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4323582b-1284-40c9-b708-f77e405d70e3/zewupimadirinep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d1e8bf-dd5f-4e58-9248-378ba80df573/ponedibizirevizizirofipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00aaded0-b768-471e-92a2-0611aeb618d6/vurukexidozurekomuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69df4ab-06cf-4d2e-8c6c-083d2780508c/freedom_for_apk_ios_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c3d560f2895dc1e72903/t/5fc139fa3485235c86f395d7/1606498810794/gwinnett_county_calendar_call.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6751d27a199023adb75cf/t/5fc6af389b1ed03538cb0fc3/1606856505186/26393201926.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc704532122570d58ffb8d8/t/5fc7c1d056cd4459b3c4bbcd/1606926802005/71190655982.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe18dc173fb5383b6a4b95/1606293725102/accu_chek_error_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faef34fb-2886-4422-a525-1e50115d2e99/27929904326.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_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 5044 bytes
SHA-256: df32f514d206a21467df5b55261bfd04d24f168bd6a6ce299511c73639b98b63
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 10608 bytes
SHA-256: 5760fc9cf005ac497500c7cad0d0bf1fce526462681c09228e87c0f0c61915f1

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