Malicious PDF — malware analysis report

Static analysis result for SHA-256 21317cab2ef8aa16…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 15:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fc69fbbf003ace41789bc20feb791ca9 SHA-1: 1f72b26296ace68ab92c0a8ec780835c1c2e7f00 SHA-256: 21317cab2ef8aa16868e5c22880c8640810cc97c20a8aef47784d11d6be02284
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=nadi+astrology+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382770/normal_5feca0fa86ad7.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/cglidjc/daytona_international_speedway_logo_png.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/hhXtEja/5196818466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_605bcbdfa7d98.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jgjdtFh/wechat_pay_users.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/bjbjiZv/zelda_parallel_worlds_1._23_rom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff381b587718.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/njjFvZW/fobakesapevakosomigujitis.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/gjgT7jc/futsal_championship_2020_street_soccer_league_standings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494147/normal_605874f7a25d5.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/amgfqhc/fasenoxuwuvezuju.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/H5argdT/planetary_society_membership.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/VicwjgC/shareit_app_download_jio_store.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/d2iYmef/57015759757.pdfIn PDF document text
    • https://cdn.sqhk.co/sufajezugi/jZiiUcY/futereze.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/bejexe/pejabotuxakala.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/19668526734.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/sovowozivegudoxewizew.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_c8cc3eb9e0ff4481850ce0dd79781e83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/suwikolavebewo.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/how_to_fill_personal_allowances_worksheet.pdfIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_8031799d83f4418a9b7ea67c47e53c3e.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_aab91fbb49dd43a89e86a537d954e665.pdf?index=trueIn 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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 5484 bytes
SHA-256: 1ab522777a3e1469e2a4bf097725c7b84efcdcff81d0d1b8abd00de25f863ef2
font_01_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 11280 bytes
SHA-256: a677584ec7a77a747cf1683c079cba60dd19eae77a36e2eb00cd5a70b4ef2c7f

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