Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b971da02733cfee…

MALICIOUS

PDF

71.5 KB Created: 2021-06-08 10:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a3d41a9a04575552064c22d1181561ab SHA-1: 04541600197c0e07e6b9619a31d576918232393a SHA-256: 2b971da02733cfee6c85f5e18a40d30fa2092609769cab4b118c4f0fb5b4fb7f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to reference software downloads, indicating a phishing or malware distribution lure.

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 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://philabc.ru/pbw?utm_term=google+chrome+portable+48+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370525/normal_602d7e17f0e29.pdfIn PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/4446358.pdfIn PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/6466855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a43d46d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5ff1372e88ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_60b998a8d1f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_602bb2f50d3cd.pdfIn PDF document text
    • https://nipixejewawowe.weebly.com/uploads/1/3/0/8/130874539/7983156.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/e226ce8c77cf95a.pdfIn PDF document text
    • https://jopegivev.weebly.com/uploads/1/3/4/2/134234712/aba87049adba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejufavo.pbworks.com/w/file/fetch/144700623/lajimolafesirifow.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/ribiperavokoxuzamewulat.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/zawemifuvuj.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/f/how_common_is_myelodysplastic_syndrome.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144527979/wulidemoxupovugi.pdfIn PDF document text
    • http://serukula.pbworks.com/f/660631047.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5620 bytes
SHA-256: 172edef32608ceb42a75cf2fa9a321dd91cbc0def8b65d41a2c7779d5c3a25f1
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10552 bytes
SHA-256: 6dde72c6e742d463a9c05acddfbac6b2693e5df6a2d5abae2cd83944b286d727

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