Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2a7d0d383ff71e…

MALICIOUS

PDF

73.8 KB Created: 2021-03-15 13:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc42c2d1721d0a4d425d97317435e8c4 SHA-1: 7e985b34e32c1935ce685d4e8440c5dc29e8ff51 SHA-256: fd2a7d0d383ff71ef958e9254309244740804be6b3ae619f1fe2cb60d1fd014e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's deceptive content about starting an outboard motor are used to drive traffic to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+start+a+johnson+outboard+motor
    • https://cdn.sqhk.co/rogenujudita/j4giVqI/20159284206.pdf
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/bonikemegaxozax_nodijulaf_dufativi_vuwakeweb.pdf
    • http://barberking.best/esl_english_classes_for_adults_near_mea12ju.pdf
    • https://cdn.sqhk.co/pexudolifa/gcibihd/muvomipasoxefi.pdf
    • http://bigchance.pw/tijawapetebv874j.pdf
    • https://cdn-cms.f-static.net/uploads/4366305/normal_60111ffe3d577.pdf
    • http://dashcamtopbest.com/kawazbkhxd.pdf
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/4799665.pdf
    • https://madudezogimune.weebly.com/uploads/1/3/4/3/134326665/1775619.pdf
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/1851327.pdf
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/melipuge-dadabapod-xabepotofuvidi-berimidelatat.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_60469ae6056dc.pdf
    • https://cdn-cms.f-static.net/uploads/4393020/normal_6020c487a9c91.pdf
    • http://topdiscount.pro/97403243070rlirg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_87cbc38c2dfd439f8d70983bf12571bc.pdf?index=true
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_01fe84fc909146c5a73819247f4085df.pdf?index=true
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_7871db296af4417493cbc5a222b70472.pdf?index=true
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_f4f49ec5b4064fbb95e0bff06ab89259.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_e51149df16a4475fa676ba58eaa912b0.pdf?index=true
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_bf0550474b4d4bd8ad4b1f03a537c548.pdf?index=true
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_679a4967e05f4f37a048a7529666529d.pdf?index=true
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_f6057aeb412940cd8f263aabd6cac282.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_7f33e4734f614b798a82eb042ca46601.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin
f39c415d68daf1a2accc80a1667416ed5ba401dea64a7b268770b42ee817ca81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5300 bytes
font_01_sfnt_off0000f72d.bin
363052ba0fc0a48d1515b91197d5bf98221ad59268168faa959d2a4c3e00fa7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10136 bytes

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