Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b1b122983e0f30…

MALICIOUS

PDF

108.7 KB Created: 2021-03-27 13:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4625d00cbd2280c2257b851c89660d32 SHA-1: 5c736bd4ed2ffabb149ce874a18c3d34a136ea90 SHA-256: c9b1b122983e0f3076e8a3224a86d39e72c94de8df153f78ba78a184ca4710b8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=biochemistry+basics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5fd793e74a059.pdfIn PDF document text
    • http://talakam.space/58174936062kekhp.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/ha7cIhg/bolanawunisusevo.pdfIn PDF document text
    • http://perevod-card2card24.site/522761522620y68z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_604e752291d7a.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/i9oPjgV/solenotowonureluwuju.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/hpR5vhj/37819100387.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/iiZSz2R/beeping_sound_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_604fc367ef490.pdfIn PDF document text
    • http://jinosewifuwefe.22web.org/titas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_6046bfcca68a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5ffa991fbda1d.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/bI6vBqa/eu_merger_control_gun_jumping.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5ffe73ea41558.pdfIn PDF document text
    • http://toportt.online/vemobibapolutetev4if50.pdfIn PDF document text
    • http://sesumuruvo.22web.org/nokakugelimajatavazimimux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff77a7bec4e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_605dd46a5cd06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_4c6b014132734bd491bab98807bd7c3f.pdf?index=trueIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_4d4dacb193d84a2daaa136f7d5658769.pdf?index=trueIn 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_off0001689e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689E 5652 bytes
SHA-256: e2d76016b1860827a061fff9cf207e90bc231c032c03d59c42127a05b0d71118
font_01_sfnt_off00017baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAF 12588 bytes
SHA-256: a054c450c0dfab35f0c4cbd61196fc4785cbe15f20568a967f2bea33f331dea4

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