Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c694581589b21b1…

MALICIOUS

PDF

72.1 KB Created: 2021-03-12 02:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: efaae0aa35a2f6fe04c48b9213029475 SHA-1: dc80ac2aa8a145b80e01e1e682db7c9d5c8f99de SHA-256: 3c694581589b21b19a35a1ac4eaf8db7f644f84818e4bd52a5d29ea626eb03ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'ac and dc current' to entice clicks on the embedded links.

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://zajinet.ru/award?keyword=difference+between+ac+and+dc+current+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387427/normal_600308bb5c7e8.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/Ehhhg7h/77775625821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_5ff1925726eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_60399e0c884b9.pdfIn PDF document text
    • http://womotov.22web.org/english_speaking_course_file_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/hizGhcq/74972622074.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/htEifjh/neon_light_running_vest.pdfIn PDF document text
    • http://sinekem.iblogger.org/84689624734.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/0EghBQF/49674659073.pdfIn PDF document text
    • http://lemixop.iblogger.org/vixutasaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fd0ed2bc2d29.pdfIn PDF document text
    • http://sokadap.22web.org/tanupuvuvitijul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5fdd963bd4997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_60038947264e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_265aab482f684223955e5f8acefece7b.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_64a9aa5da7d0489aafb3a8072b93718c.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_8066fbedcf1f419d810ef0104edf50b4.pdf?index=trueIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_0c224dacc0d94808ae2dc5d99e6ac3db.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_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 5172 bytes
SHA-256: 628f79c47d43c7f2d8d17c703dae3784349d201a72f0f7c95a4e0f7a26875a36
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 10184 bytes
SHA-256: 02ce018d015bcab37f0fddb71f39d894c0573a6fe318fe6479b8283ddf36dde1

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