Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b205831a14d728…

MALICIOUS

PDF

91.0 KB Created: 2021-03-31 18:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe44b47a672a1b59228ea79d283cc3a9 SHA-1: 7362358d51cc883b33c143423f1c5f07ea3d6f18 SHA-256: 34b205831a14d728f203cbd442f2110e349012136206248110dee45e8a61f128
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a high heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, appears to contain keywords related to technical repair, likely a lure to direct users to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=how+to+repair+kenmore+sewing+machine PDF link annotation
    • http://power-guard.shop/mafalda_tiras_completasnah7l.pdfIn PDF document text
    • http://itawegan.space/nuxopirenuxe4xuk1.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/irrThiP/dragon_ball_z_infinite_world_pc_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_6003252bdb7c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/KOCjehb/kipowudaxosatugajutixibi.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/daterukmpnf.pdfIn PDF document text
    • http://linza.media/carrier_weathermaker_9200_flame_sensor413p4.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/cjjhajg/browns_nick_chubb_injury_update.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/ahmedabad_city_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_600a237f7c84c.pdfIn PDF document text
    • http://theraisins.pro/area_and_perimeter_of_composite_shapes_worksheetjs12e.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/gMihpWS/scuf_gaming_controller_xbox_one_cheap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5feb6a36d51fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_605309597b5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_60064bc5e6ced.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/foneniz/best_archiver_app_for_android.pdfIn PDF document text
    • http://zevusup.atwebpages.com/xezozu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/job_application_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/soundcloud_for_pc_windows_xp.pdfIn PDF document text
    • http://defimaromibituf.rf.gd/algebra_brain_teasers.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/91322743549.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/lotugapividato.pdfIn PDF document text
    • http://tusuzexuwijoki.rf.gd/23050297421.pdfIn PDF document text
    • http://jixosakotipol.epizy.com/softbank_vision_fund_portfolio.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D4 5432 bytes
SHA-256: 7c6ef2872ca4b2cb9c33cf8f7432d5ff3076c1baae26e3e8e2afab5cace05a1c
font_01_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 11272 bytes
SHA-256: 5683b9fe8fa94391130c5dcbd7fc46ecc80dcf479703fcf68fd6d666d53c2c5b

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