Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d9605f221c44b2…

MALICIOUS

PDF

80.4 KB Created: 2021-03-10 09:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0bcf6df9f27c3c606b35a63ace48c6e1 SHA-1: bbf1b932692b2cf1577640e32f9f54fe9dce28f5 SHA-256: 19d9605f221c44b2f6d69a564363fe5a5335a6418323299ad3a20756cf12d8c1
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it's designed to redirect users to numerous external resources. One prominent URL, 'https://xezojetit.ru/award?keyword=investment+casting+defects+and+remedies+pdf', is embedded within the document's text, likely as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=investment+casting+defects+and+remedies+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479435/normal_602650029d8ba.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/f1fc3edbd.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/badukemowibu.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/meferegot.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/vesokabimomulagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_600f2f90c4a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5fce60cc8f286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_603b2b28154e0.pdfIn PDF document text
    • https://lirejodeju.weebly.com/uploads/1/3/4/6/134628820/memuzuwunagovu_wumagisiboxalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_601850f9759d4.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/wivunonovef/18411302853.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/business_development_specialist_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/alcohol_120_free_full.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/lopressor_davis_drug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775f0c66-e611-4828-bae4-0968403d7594/nuparovopevetivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef660b2-a335-4371-9bdc-b669316e7858/morning_pages_journal_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5ac991-318c-4072-ad29-73dfe2d0a43c/fapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12184984-147a-4e0d-89c1-84e957dcd47e/3465465460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ff6da3-68d3-42f3-bd7e-f8e51663c360/9670484650.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/49846715450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd34e5-e2de-4000-8c78-b0c1d4c4d62c/kuvumovijagozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a818f5-9148-4eea-a6f8-f895c708f17a/slader_fundamentals_of_differential_equations_and_boundary_value_problems_7th_edition.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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 5440 bytes
SHA-256: 487644050d41d047ac56656dd016cadd4b827ee08e1a515206dce226e87b8131
font_01_sfnt_off0001117a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117A 10084 bytes
SHA-256: 4c4dd114e19f806bdbec3f2e14dafc7d161c51953a5711a8de08acbbded402c6

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