Malicious PDF — malware analysis report

Static analysis result for SHA-256 b434dd3a7319b4fc…

MALICIOUS

PDF

71.0 KB Created: 2021-02-20 17:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37fb5e7e288d88d3ef69beb2b3e385cf SHA-1: 274ca939dca1322ed5c52b35e13724ba298349fc SHA-256: b434dd3a7319b4fcd892661c44a204dd14cf5a06c027201eeba55c3e4adacfa4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=positive+thinking+definition+wikipedia PDF link annotation
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/5bdfbde9cc2c65e.pdfIn PDF document text
    • http://nekretnine.site/41159242900w4ubm.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/damidesusofolunix.pdfIn PDF document text
    • http://bumaga.bz/avadhuta_gitarie7h.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/4178932.pdfIn PDF document text
    • http://love-your-lips.online/laserbreak_3_physics_puzzlesqdsgh.pdfIn PDF document text
    • http://alex-travel.moscow/tiwajerajaxarnrvkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_6013bb8cb2c08.pdfIn PDF document text
    • http://omshop.space/puzzles_and_dragons_apk_modxi8qm.pdfIn PDF document text
    • http://rawenspant.online/54151898639l40v2.pdfIn PDF document text
    • http://libralab.digital/nhm_thuc_cephalosporin_th_h_32367z.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/neniduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 5392 bytes
SHA-256: 18ff44e1550e31350bfdae1feeb6320c830716989517d4faef21803d05402aab
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 10780 bytes
SHA-256: fb60e7e8afee9e1a615985f1d2d55bf25e78dda68bb2797941e32f9427c8d236

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