Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6166b650a4b1556…

MALICIOUS

PDF

65.3 KB Created: 2020-12-03 09:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 051f5de57d6ff778ef8ffaa54cf5a18b SHA-1: 7a5f725f8c7faf70b451209d710b61cb0fa32ef6 SHA-256: d6166b650a4b15568900a719200df3be39c7d9b008808bf7169d2d6a892f0e25
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being traffset.ru. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=4th+edition+d%2526d+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f95099116cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fc23b8abe5d9.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/wajapekevifef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5faf529fca5b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/disafaxokagopazazisovoxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f809e9e-793b-4eb3-8aee-2539f8b0aa56/jason_ferruggia_training_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4b7924-02c5-4f1c-ad26-9f74847a5a11/2008_mercruiser_4.3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tekujel/volkswagen_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/3391251973.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/mtg_whirza_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/karifopenolunis.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/bibby_line_group_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/xigepapawukijetojomawoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/98109170256.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_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 4392 bytes
SHA-256: 1253a84b3aca7ae5906b1adf27430e2d7a24ae443d7f3c6b5ca5c263b20a026d
font_01_sfnt_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 10876 bytes
SHA-256: bba88d8584aa89fd176dfcff28479992decd8eaa9e2079f2aaa1e6ab903a3d72

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