Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c92a134efe199d…

MALICIOUS

PDF

72.0 KB Created: 2021-01-06 11:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7efc1162953b5498655b8a00221887b7 SHA-1: ee951344ef1758cbb8211db27c70afd7da61b84c SHA-256: 39c92a134efe199dd6cece7f5850a846580f93e9c092be4a944d5be3f2702871
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains heuristics indicating it is a credential phishing lure impersonating Microsoft Outlook. It also contains numerous external links, with one pointing to a redirector that leads to a PDF file hosted on weebly.com. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/6787491.pdf.
  • 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://trafffe.ru/123?utm_term=adobe+genuine+monitor+service+nedir PDF link annotation
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/6787491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ff330c84d66f.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/6d043902df07605.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/9770195.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/mFfUhcb/77383976010.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/tonemakopinibem/vuwajilifajisesefidokeki.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/timesheet_calculator_redcort.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/39498600970.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/event_management_company_profile_india.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/kukewaxafadofeg.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/35627320674.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5208 bytes
SHA-256: c8c3a57986b5374facf3a510041dab5622098515f376be395492f5c61c5d111b
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 11308 bytes
SHA-256: 8d0cf1e7def173c09f303e5d8b31155c28b10c38dbe47865f1c2e0c79050f411

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