Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b3d51db6c0f141…

MALICIOUS

PDF

76.9 KB Created: 2021-05-14 09:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30a0a2ab18be2711f479b00fb5539c5b SHA-1: c9445005b0bf54963d3ea9899708dbfb702b5b3c SHA-256: 29b3d51db6c0f141d4087bfb39fb797bbb8bc9ee7f661ac79239d2e0a44ad9a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of numerous links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=lenovo+y510p+battery+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472213/normal_602f1ebef2aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_606a0df94aeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_605262f0e37c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_60399718381cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_6009b30823c78.pdfIn PDF document text
    • http://ttttrrrr.space/42083954610q8idd.pdfIn PDF document text
    • http://betflixguvenilirmi.com/pugupivubifibesibuti4345y.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/mhbhaUp/glider_long_distance_paper_airplane_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375907/normal_5fe47ff35f25e.pdfIn PDF document text
    • http://50offstore.info/how_to_build_a_graco_pack_and_playgnyls.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/Zzihiie/44570676078.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/hjaXWjj/bloodstained_shard_guide.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/97358247784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_602da4e508e69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495050/normal_60059cadf1c27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445331/normal_5fc9647e176c2.pdfIn PDF document text
    • http://accface.in/2300707523453lui.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/is_simcity_4_compatible_with_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimufoduso.rf.gd/kant_and_the_problem_of_metaphysics_heidegger.pdfIn PDF document text
    • http://modejaj.epizy.com/xeliwafojasinesonawusox.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/fakanives.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5304 bytes
SHA-256: 8d66e2864762a2a90f11a1e3a1d95fd31c9cd8b3cbfe448cb55e430861ed4c0f
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 10736 bytes
SHA-256: f5f23108b44c34ae02632e52571649694b2c1513962c6a7271e2cd9e20537052
font_02_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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