Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fed250c7555a2d…

MALICIOUS

PDF

75.5 KB Created: 2021-02-19 17:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a2261c2b4ac71fe6377c4eb6bce4774 SHA-1: 8ed649a0da823982e10e1fbd5afb4a362476284a SHA-256: b3fed250c7555a2df32f009204d7ba11c2fcdd5efac9cf3901c78d59edde1964
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is 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://seumenha.ru/wb?keyword=evh%205150%20iii%2050w PDF link annotation
    • http://reduslimer.website/2305082326dczq1.pdfIn PDF document text
    • http://nuxefigemotak.22web.org/aitsl_assessment_application_form.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/lebipoxujur_wavumak_vomagiwale_pokebaxox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ff65c618e9b5.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/3861301.pdfIn PDF document text
    • https://rojirewika.weebly.com/uploads/1/3/2/7/132710632/musixukiwure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5fceba86c2ed6.pdfIn PDF document text
    • http://olx-delivery.cc/infinitives_worksheets_for_grade_8fnrkx.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/prigogine_order_out_of_chaos7tjdt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5fdffd6bd8f79.pdfIn PDF document text
    • http://skidki-day.shop/mickey_mouse_hot_dog_song_ukulele0wezx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofunuxemijowex.rf.gd/phpoffice_spreadsheet_to.pdfIn PDF document text
    • http://zurinelu.epizy.com/sorazonimujo.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/33217517566.pdfIn PDF document text
    • http://velizufilalate.epizy.com/wegodesozozunes.pdfIn PDF document text
    • http://bidavotajowev.epizy.com/encyclopaedia_of_islam_new_edition.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 4684 bytes
SHA-256: 6570c25e20421094cb87a432973c4d7e72321954183c033ce6c390ed489b930a
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 11416 bytes
SHA-256: 0c2d29634b94c1990220e5b6ddf771daef6e59495a4ef59baff09635bea88b2f

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