Malicious PDF — malware analysis report

Static analysis result for SHA-256 619cd09be933fa6f…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 05:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9316abdc9d8e91f1b77b75d8486f3cc5 SHA-1: 4b4a1260af18a097de565176889907150dca0aca SHA-256: 619cd09be933fa6f72fe1ba243fa88bb80773858dd0b786dad9060f3a23412ce
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 hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate but ultimately untrustworthy domains. The presence of external URIs suggests an attempt to redirect the user to malicious content.

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://jottigo.ru/wix?keyword=sony+str-de197+wattage PDF link annotation
    • http://xeeewq.xyz/cisa__certified_information_systems_auditor_study_guide_packtis4z4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5febaa7828e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_601d554731dac.pdfIn PDF document text
    • http://qqkaxes.xyz/2579081100afsw8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6016c6a5b89b5.pdfIn PDF document text
    • http://dvigatel.guru/ssc_maths_algebraeaf0e.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/3Kia1mP/funny_notification_ringtone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_6020b4e011ba4.pdfIn PDF document text
    • http://twirlini.com/lorenzaccio_acte_3_scne_3_lecture_analytiquezc77o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ffa3ca3e8728.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/femibgf/slot_machine_games_free_download_full.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fffcb1d597c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389824/normal_5fec7e99e0eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5ffeb4d50032b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebefabose.epizy.com/unconscionable_contract_case_law.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/fejamajuvupolededu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 5576 bytes
SHA-256: 55e515f8f58d2cbde7a6ea80931b02848e2acfd0fb367cb0835e73a74485a785
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 11040 bytes
SHA-256: 82262521559b8015ca3016fb728ed9cb2cafb06af27d276347ab79900edc56a7

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