Malicious PDF — malware analysis report

Static analysis result for SHA-256 403951dea085545c…

MALICIOUS

PDF

69.4 KB Created: 2021-02-26 02:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e111e39d6ff8071767fba6cb3b5db0fa SHA-1: 7ace7a08f813afaf39eb88aa904261f968deecb2 SHA-256: 403951dea085545c8a890f0107d5b2787ba5aedad5751a9536e35f5a3edcced9
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://bologen.ru/award?keyword=floral+maxi+dress+next+day+delivery PDF link annotation
    • http://tezibif.mygamesonline.org/how_to_unscrew_stuck_lid.pdfIn PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/bumilu-vuvixoduzi-fowomopuxipewa.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/iegjigK/76824286303.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/fjdbihU/16420572605.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/g2YgiwI/toon_blast_lives_cheat_iphone.pdfIn PDF document text
    • https://vosasavowaje.weebly.com/uploads/1/3/4/5/134587316/2565417.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/foposifawuzaveze.pdfIn PDF document text
    • https://cdn.sqhk.co/dovewobojeb/9ijhihi/guilty_crown_wiki_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/aidhbge/zedd_house_architect.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/dean_koontz_frankenstein_series_hardcover.pdfIn PDF document text
    • https://nolopatemima.weebly.com/uploads/1/3/4/5/134583633/3588459.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/fexuror/laravel_email_template_builder.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/gozagupirudobodixek.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/btv_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/what_is_a_power_structure_in_an_organization.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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 5156 bytes
SHA-256: 1edee8898fb66d77b28c310e8b870c23d952639bc3193a690aef0af12276274f
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10392 bytes
SHA-256: ca8b39b0a1510f880b15c36e890daf37c85a6c96780833bf4184cc968b18b81d

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