Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bffc1f8768e08c3…

MALICIOUS

PDF

77.4 KB Created: 2021-02-28 02:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3870820046567bae62cad7d06e8f72e SHA-1: 447f22ef8a47706dfae73026d0e14688389177a8 SHA-256: 5bffc1f8768e08c3e56416d346cb1b2b0912cb5ba3dd56540332819d364cca02
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a prominent one pointing to 'mezovuduw.ru', flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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 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://mezovuduw.ru/aws?utm_term=robert+adams+prints+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416789/normal_6006fb212c087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460954/normal_600ea7e631070.pdfIn PDF document text
    • http://mewibapevuwado.22web.org/diruvuzogokojazomebotido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fe621309d3ed.pdfIn PDF document text
    • http://wibedepotemuru.22web.org/golovitowivixab.pdfIn PDF document text
    • http://gexedufez.22web.org/82353233774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6037b4b2ccf8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_600cf5432910e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_6025f30cae429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6024ab99f1179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_6007e64f9f449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotuwelu.rf.gd/69086781554.pdfIn PDF document text
    • http://supetok.rf.gd/bulleya_female_version_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/kelirirumoxawifaboratuki.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/rozonelowifefe.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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5332 bytes
SHA-256: 1325ae80e064809e0aeb74fc81c913ebbe32288cf38dd34381de1262347b02f3
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 11788 bytes
SHA-256: 9cbd8f36384f6f9185ee2dbd798666efd67de96fedc8f736eded8f7b366abd1f

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