Malicious PDF — malware analysis report

Static analysis result for SHA-256 9659e920f49263cc…

MALICIOUS

PDF

70.9 KB Created: 2020-12-20 07:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2729460060befc072394fb773a20935a SHA-1: 9cb94a014771c9153195497569f4c69203d4273b SHA-256: 9659e920f49263ccd55ae30871219726ea8e80ed69f40fc3e032142529f6e841
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on S3 buckets and Weebly, suggesting a link farm or SEO spamming operation. The primary URL, 'https://trafffi.ru/strik?utm_term=matt+kahn+youtube+2020', indicates a potential phishing or malicious redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=matt+kahn+youtube+2020 PDF link annotation
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/kelukenugifaxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa0932ab2467.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/tiduka.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/ef37de4.pdfIn PDF document text
    • https://pomaripo.weebly.com/uploads/1/3/0/9/130969966/8839239.pdfIn PDF document text
    • https://sazigusejif.weebly.com/uploads/1/3/4/7/134771803/5741851.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/pizivurapab/14710002494.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/dobolu.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/tepozobugunasemokomov.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/answers_to_defensive_driving_test.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/crtc_complaints_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/54679028369.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/al_quran_ul_kareem_dawateislami.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/hueso_cuneiforme_lateral.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 5052 bytes
SHA-256: 0b448e5439e243ac779dc48134c08c8d8641997c66c9f2ba1e34c150b78c3b3b
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10592 bytes
SHA-256: dd1d2dbea86841288866ab761e2893297af70f4985c2d0a8c1a17c94ec4a49f1

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