Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31b98e66d97c5b1…

MALICIOUS

PDF

81.7 KB Created: 2021-02-27 06:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e60afd996ea5b1b595fc51dcff6f905e SHA-1: 597d0f5ce80752ecf195bbe86735fdb9f6df7b23 SHA-256: a31b98e66d97c5b18b41a740ea251eec9a8ca424986a8d48a42eeb4c7ce31b23
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=how+to+write+a+paragraph+3rd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5fd0ea714ed7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_60314081239d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_6008cddfa90f5.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/free_printable_thanksgiving_worksheets_for_preschoolers.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/6899799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_600a03800c742.pdfIn PDF document text
    • http://wirelessinfo.ru/wexefojijab6er.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/zikokuzive-gonigezaxa.pdfIn PDF document text
    • http://qupieasy.online/cress_marissa_meyer_vkeaf1o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420586/normal_6004d96c2c77a.pdfIn PDF document text
    • http://jumpfs.space/zapajomolebedebeminow8j8vv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepevakadiw.rf.gd/smash_mouth_all_star_music.pdfIn PDF document text
    • http://ludezowitupaxel.rf.gd/31265246379.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 5228 bytes
SHA-256: e5933a8c2ee2b764a1b8a50ceb7e0b676551fcaec4bfb0e6074852bfafbbf0e6
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 11160 bytes
SHA-256: dfc00af40edd36c2bdee27d199b9bc27e011e5caabd9726819ffd2fe607ea696
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 16392 bytes
SHA-256: 65be0a6854ef3d905ecb2fc4d3a5a2147560f3c5faaf050bbd171ae8e01ce8e2

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