Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c277f48d7b960c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-29 14:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9114500d6e1e99ed7851a2219fa4c5af SHA-1: 0ccd0d6a5e7d3fd7a32a82ea5a2413394d734557 SHA-256: d7c277f48d7b960c3e875f4d926c5b679bef0be0d7b73fb8a2ff641fb10d0f82
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users to other PDF documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=research+methodology+and+statistical+analysis+for+m.+com+pdf PDF link annotation
    • https://cdn.sqhk.co/badaxiloru/sbtV5gi/online_free_english_dictionary_and_thesaurus.pdfIn PDF document text
    • http://dirupomavi.iblogger.org/lean_muscle_workout_plan_male.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/gjgdVpB/55851658019.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/dEj7Xif/35069562886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_605f5a249006f.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/xuzusupaligasipakeso.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/WUTggeK/58652729666.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/hcjcicG/73026482623.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/ff995a3666.pdfIn PDF document text
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/wenobixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422390/normal_5ff2039801fc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_62cb7abbc6474ac2ab72d6427b7f21c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6652a578-3d57-4564-a8c2-b5373710d5a1/36110551681.pdfIn PDF document text
    • http://kavolimuteso.epizy.com/dewaroliva.pdfIn PDF document text
    • http://wozetarep.rf.gd/episiotomy_repair_rcog_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af659e1-48c0-4f4c-a248-36ae57f4624e/str_dn840_4k.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_1a3f1d8f5e4445de848fbfb6084351a2.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_f7c9099afacf49399873e297ed44d684.pdf?index=trueIn 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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 5708 bytes
SHA-256: c9d2d69d10d2455962c07a3590f78fc9cbe835b7b0e77ea240c77536b03ca0b0
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 10800 bytes
SHA-256: a499af787beb9ef013d7e3e338c530db409bdfdc88872a276a4453f717cac7d2

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