Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa6e2348437068d…

MALICIOUS

PDF

68.1 KB Created: 2021-03-05 23:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7a03bc7c23774bab7aaa51dc5d0e8561 SHA-1: 7751055fe7cb833d7a96a59c57e5b2c6cae72da1 SHA-256: 3aa6e2348437068dc6a94006ba094b04277d2e90f8e9d44417403648ee1c25cf
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains an external URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or phishing pages. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

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://vilenefex.ru/strik?utm_term=letra+del+toque+de+bandera+mexicano+completo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5febc2eab6691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_602e98aa73205.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/what_is_a_seasonality.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5fd18562ac20a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_602398592c412.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/acer_i3_laptop_price_in_nepal_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fd7a777bfbbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5fc9cff5b7e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_602402ebbbd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_602e301b1b57f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_603c00cfb3f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_603848e60a911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masokijedeneda.epizy.com/88202782643.pdfIn PDF document text
    • http://ruxuvejefo.epizy.com/pipafobi.pdfIn PDF document text
    • http://nolivajujereram.rf.gd/medicare_guidelines_for_diagnosing_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/tefizeruvitidixurami.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/tencent_gaming_buddy_mobile_legends.pdfIn PDF document text
    • http://lekirajadu.epizy.com/liquidity_risk_management_guidelines_rbi.pdfIn PDF document text
    • http://penanaras.myartsonline.com/51637616580.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/canyon_endurace_cable_guide.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_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 5316 bytes
SHA-256: bb9614a3ad755c88b597827252a3c6ffd33fac2a437bb717c990bffe9aa0ac27
font_01_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 11240 bytes
SHA-256: f14b2269a4e73d24fe55e71d9c72eaaada78c6224b2e6c02e2ea80b06b119306

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