Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec7bd3a418b435d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-24 11:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e61855b98c6774edbbb26ea9c4d9cf0b SHA-1: a68fbe938b73cc8a25aa6e3d4462ecbcff0499ab SHA-256: 8ec7bd3a418b435d5c3e1cc5b99e80f5a9f64ffe9836c08310adfe8b919609e1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and potentially malicious content, suggesting it's used as a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=the%20heart%20of%20darkness%20summary%20litcharts PDF link annotation
    • http://justiciaforjustice.com/sabamh4rlc.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/vpheidv/move_list_mk11_ps4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5feb8045a1551.pdfIn PDF document text
    • http://xitnet.fun/population_actuelle_de_la_republique_democratique_du_congodlizj.pdfIn PDF document text
    • http://discount50it.pro/parkerbrand_52cc_petrol_garden_brush_cutter_grass_trimmer_manual4pekb.pdfIn PDF document text
    • http://pumba.fun/cassette_to_cd_converter_software_freewug6u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fe70094844df.pdfIn PDF document text
    • http://rankingcoach-apps.com/529236755656fn5n.pdfIn PDF document text
    • http://7lessons.space/iphone_won_t_ics_file1vx62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_602f95bc1da87.pdfIn PDF document text
    • http://yewes.fun/costanoan_tribe_information21p5m.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jcihBgK/woxobanut.pdfIn PDF document text
    • http://hrushch.space/6194965961zrx93.pdfIn PDF document text
    • http://namedaun.fun/bubavunemajajodortihj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485695/normal_5ff4b9cda1fc2.pdfIn PDF document text
    • http://paypallsecurity.com/10_routes_of_drug_administration93ecl.pdfIn PDF document text
    • http://emirofficialzm.com/what_does_indian_sandalwood_smell_likew8fo1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fd263e2170e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5376 bytes
SHA-256: f2f585250daba6a26166c2863ab285e6f1d33d78762e8e24b9c254aaafa5d608
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10180 bytes
SHA-256: 51930a8b929913f5fcd651a5b7df34bf31616da20bf19e127f00b144a58edd82

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