Malicious PDF — malware analysis report

Static analysis result for SHA-256 4105c71baf94f0b9…

MALICIOUS

PDF

99.9 KB Created: 2021-03-13 16:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 654c3cc13a7e48a69802e08d893ade24 SHA-1: bdb21c431c7c532a7e7e403e3c8a1b7fc5558ae4 SHA-256: 4105c71baf94f0b94723ba217e9afdc2672049991e40807fdfcb5db943272cea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://golowaki.ru/strik?utm_term=sex+and+the+city+tv+show+samantha+jones PDF link annotation
    • https://cdn.sqhk.co/sovanoniwuva/gifv0gh/8_ball_pool_offline_game_for_pc.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/65300755503.pdfIn PDF document text
    • http://bozenuvobe.iblogger.org/dudizabuwovojonusaxebemu.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/bombas_de_ariete_hidraulico.pdfIn PDF document text
    • http://totalcreditcheck.info/crossfit_wod_log_bookoiimz.pdfIn PDF document text
    • http://uber-global.com/duvudifavetefebinutofuc8rcs.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/75087150831.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/sididavixibofakiu0w08.pdfIn PDF document text
    • http://kraftmann.su/zapexurinoketaxasa9yptg.pdfIn PDF document text
    • http://baugroup.info/92216394181vkges.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/ejaidQZ/robukajenoxi.pdfIn PDF document text
    • http://nawogevimogagu.22web.org/revifipusu.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/69963434499.pdfIn PDF document text
    • http://kavakedego.scienceontheweb.net/xemiti.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/jopomodilamego/bleacher_report_live_stream_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/sample_1st_birthday_invitation_templates.pdfIn PDF document text
    • http://xoninudeva.rf.gd/how_to_reset_motorola_surfboard_sb6121.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_off00014813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14813 5552 bytes
SHA-256: 397b66e83afc01753a0bfc51bde3a3776bb2b96c7eb0a2b1af1d8ad4801dbf13
font_01_sfnt_off00015afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFA 12052 bytes
SHA-256: 8d5010d9841365b22a8b4d6c8b19c4ad364c8546402048242201d1b280c35e8d

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