Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db26314fab3b1c…

MALICIOUS

PDF

61.6 KB Created: 2020-11-18 10:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ace69a9d99f182fdc8794333ea8b992a SHA-1: 74f485014bb6bde156b461990ce9210b98ee9d47 SHA-256: b0db26314fab3b1cc86787ee035273a1f666558d2437afa1b65ec002f831cfca
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=chapter+2+reasoning+and+proof+answer+key In PDF document text
    • https://fojejebub.weebly.com/uploads/1/3/4/2/134265807/015db6.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/pusuri_pujiguxu_kiduxafinizew.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/6451042.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/1755251.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/58b6bc06a06.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/vasutanajive.pdfIn PDF document text
    • https://fezojeme.weebly.com/uploads/1/3/4/6/134614855/c55983f0ad360a.pdfIn PDF document text
    • https://segawerod.weebly.com/uploads/1/3/4/3/134313685/lanumejar_niwipejiv_kewem_bedowoma.pdfIn PDF document text
    • https://xavexedale.weebly.com/uploads/1/3/4/4/134475354/wifinalovuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d553b559-a5a2-4322-b0f7-9e7a42175f0d/certified_ethical_hacker_ceh_cert_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457c407d-73b7-4cdd-8f22-a26999ed64fe/madapafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aecb270-5e4f-46bf-9298-6c47b79a07d0/rival_crock_pot_manual_and_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657018aa-0931-415f-8a25-0d9875d81f01/temuzegavitiminuneturibov.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DD 5564 bytes
SHA-256: 13bd8da48f38896681c38bab6e59e80e24d173464011275916787cf69c48ddef
font_01_sfnt_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 10796 bytes
SHA-256: cda0ba7509d2cd7a9bd166d6a7a187c34a1300d37eb2d806f952fd17656610fa

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