Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc72c578b75b9b0…

MALICIOUS

PDF

69.1 KB Created: 2020-11-24 02:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a684a2a49681c06473daa6006340d627 SHA-1: 579961f6735b14acad9f1d3cd81a93d0bf79609e SHA-256: 3bc72c578b75b9b0c6b77841b19a97950bb0bda7973f933a72eeafc2400c7cd2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://trafffe.ru/strik?utm_term=derek+prince+free+download+books
    • https://cdn-cms.f-static.net/uploads/4481665/normal_5fbae123b0152.pdf
    • https://sutudaxete.weebly.com/uploads/1/3/4/4/134497902/30adaf4a260a.pdf
    • https://manajizi.weebly.com/uploads/1/3/4/9/134902852/4323328.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f9226fd65dc5.pdf
    • https://cdn-cms.f-static.net/uploads/4453721/normal_5fbc1fbad2096.pdf
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdf
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/254574.pdf
    • https://cdn-cms.f-static.net/uploads/4449768/normal_5faf6aa93ec65.pdf
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/529602685798.pdf
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5fad13edc908f.pdf
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/bawukexunuzadij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/32733070-2d25-47c4-be24-c3d11c9240f3/pizaxazuzekesanisonufopa.pdf
    • https://uploads.strikinglycdn.com/files/b30426ff-41f4-43c4-8ef2-54b84c1b4018/7891422079.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc0.bin
56e680f8b530e09a64c0cc459ca944e98c049bd6c076a7c97b104c74c4c58211
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 5444 bytes
font_01_sfnt_off0000e269.bin
fc90734ff49a44342440a6f5d8f1087e2d6a18c2f57a2bcabe77b47879f23bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 10792 bytes