Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a3b9c16b85775b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 15:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: da65f968810a25f4362375ba6fb915c0 SHA-1: 987f5e54480e8ee099d318562402a21cc84a70da SHA-256: d0a3b9c16b85775b87e7f029f8a8af22218eff9137524171c35cf55b72fea7b0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content, likely for SEO manipulation or to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=bottle+flip+3d+mod+apk+unlimited+diamond PDF link annotation
    • https://cdn.sqhk.co/nudogada/did5diD/90362817650.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/0hXBrUl/best_rated_chocolate_buttercream_frosting_recipe.pdfIn PDF document text
    • https://zipegudedore.weebly.com/uploads/1/3/1/6/131636753/3966762.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/grc065u/basic_marketing_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/ihhaqii/suxemazigotava.pdfIn PDF document text
    • http://pay-order.info/palmistry_in_hindi_with_picturesa6wb6.pdfIn PDF document text
    • https://mokovudome.weebly.com/uploads/1/3/4/5/134598928/c98069cc5c3ac9.pdfIn PDF document text
    • https://jewesorovusupim.weebly.com/uploads/1/3/6/0/136092124/bc9d40.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/jiim3jh/best_marathon_racing_shoes_2019.pdfIn PDF document text
    • http://hookup750.website/81277680103kj4b4.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/2926608.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/6014768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remuv/absite_smackdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf69ba11-186e-4f01-9cb9-ec9e541ceb93/english_grammar_exercise_book_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/49765946863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b382ee-8c86-4caa-ad1a-b1bfc7facc78/fozosasenifuwudu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 5192 bytes
SHA-256: cb3028bafff808c3909ea8369066315fbda9ebf8e21de7c8dc193018f8c837d7
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 2268 bytes
SHA-256: 253c50839ac6626950ebb29913d4b50f84c7f91f95a3b3e9574581cbf972dee6
font_02_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10416 bytes
SHA-256: 8d8118c47b60810020f5b098ae3126b3b647914ddacc44839c2b29c3375b4934