Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ad219b23542fed…

MALICIOUS

PDF

59.9 KB Created: 2021-02-17 16:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a22597de7933143754d3238970ac75e SHA-1: 3a031c7670d76ad01c6f9b6e3d10229ab914e398 SHA-256: a0ad219b23542fedae10343d85760f102c0bf1bbe3b2b51c6d6165b1c43fa83a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'bologen.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Tonal harmony 8th workbook answers'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=tonal+harmony+8th+workbook+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5ffb3bd215a32.pdfIn PDF document text
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/7eb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6019fbecf334b.pdfIn PDF document text
    • http://wopebexe.66ghz.com/92177152851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd7cecbc7198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470232/normal_5fc7dd6147577.pdfIn PDF document text
    • https://mokefogo.weebly.com/uploads/1/3/6/0/136086775/muletasaj_zagex_boxakavimasu_tajobovebujoda.pdfIn PDF document text
    • https://malufatagu.weebly.com/uploads/1/3/0/8/130874424/varipevo-bagelirajamoza.pdfIn PDF document text
    • http://wezozubiweriged.iblogger.org/zejorelukez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefevuxivux.epizy.com/pulazise.pdfIn PDF document text
    • http://melumudinev.epizy.com/basic_circle_geometry_worksheets.pdfIn PDF document text
    • http://defafezo.epizy.com/canon_xha1s_manual.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_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 5464 bytes
SHA-256: b76e7031d3efa9d89dfeec3f099de2341b34800e796b3c66b85ebada83f12fae
font_01_sfnt_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 9080 bytes
SHA-256: aaba687b7ffd7de52bd4613c3d037e759a3ce8f49ec1470f48f007daab0e7361

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