Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacb7d33c55acc31…

MALICIOUS

PDF

68.3 KB Created: 2020-12-21 09:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 74cd4ad37588f4c7eec3f8d03a1a86dd SHA-1: 15c7da0d3a285511ee4a39a7cb681416aa3f7286 SHA-256: aacb7d33c55acc319340afeaca2a6aa6809aa01e1200df109d27cdc22055ca42
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://traffnew.ru/strik?utm_term=origami+paper+size PDF link annotation
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/fuwexefafo-sesurexapu-mimexubuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fa6f6751f161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f94898bc71f5.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/3931828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5f92c946816e3.pdfIn PDF document text
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/e73ec72ce33.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/5543735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_5fb5f1600fb55.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/7490125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fc701101339d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5381a405d5340f345f063/t/5fd229b9ad61ab583194106d/1607608762488/neon_live_wallpaper_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/63665234771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e952b6e-2271-4e01-abc6-6bbc7e97c02a/25056139958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301c4f80-7ea0-427d-823d-4cffc720faff/e_myth_attorney.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 5184 bytes
SHA-256: d2d487496d543efe4496209c6362fbd0cc7544c79a2df317eafc3dfb9c077eff
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 11376 bytes
SHA-256: 0c0292ffc0803b607f3b1df94a774bf852392535f05f359d6e7e88b222303a4e

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