Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce3c91a3f927b47…

MALICIOUS

PDF

73.6 KB Created: 2021-02-25 21:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9d6ad50a300bd5ad7feaa9b80fc9e021 SHA-1: 865d10673ef59e6b052b2a1aa3f15208f00d4694 SHA-256: 2ce3c91a3f927b47ce62191ff2da7630db27b4fd81fbe69a05f054cc4c995cd0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document content is designed to trick users into believing there are changes to payment instructions, a common business email compromise tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

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://jacksth.ru/wix?keyword=bluestacks+apk+pure PDF link annotation
    • http://shoplus.info/pipegokagevipavum77x8p.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/32056520172.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/3798620.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/RICcFhb/maze_runner_3_summary_movie.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/b190a5203ffee.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/o4UjbQk/mesufavepedaxumilede.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/hj0ja8f/secret_codes_for_android.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_use_mini_keurig_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/eijjDwe/homemade_gingerbread_cookies_easy.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/e7f96f941.pdfIn PDF document text
    • http://momentshop.space/single_phase_capacitor_start_capacitor_run_motor_wiring_diagram3w1qs.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/can_you_track_priority_mail_international.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogosugo.onlinewebshop.net/27244996174.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/tagumonibos.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5040 bytes
SHA-256: 21415112a8a401158b1209e9c4aedb2076bc6835b6a204f605081c99acba44a6
font_01_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 11196 bytes
SHA-256: a7e80a8ff010370aef5299f7c7577b9ba27c9413fb0dc7fd531ef1f89649b3d7

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