Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8313e3dd362eed…

MALICIOUS

PDF

89.4 KB Created: 2020-11-18 02:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 90dd4b2a6b733478c5fd672a752efe8e SHA-1: 882444dd9c6c08be7daa56b04c5a31838d8f86fb SHA-256: 4a8313e3dd362eedab533934e0e9f77dc46f20375ab87dc207e163b4a2f397a4
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, heuristics suggest it acts as a callback phishing lure and a payment redirection lure, aiming to trick users into fraudulent financial transactions or calls. No scripts were extracted, but the presence of malicious URLs and the nature of the lures strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/123?utm_term=shingle+removal+tool+princess+auto In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c83c7a-eb07-4266-a081-c5004b61e78e/49382290160.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/28631132841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832fa3a5-db8b-4a98-96b5-f705f3de258d/infratemporal_fossa_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/81924318645.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/aba_code_of_banking_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78dcbd44-221a-487b-9acc-8fe311bd0833/84911053062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf49f930-1ed7-4b46-ab43-d286c0564d9b/el_asunto_serie_critica.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/girl_scout_graces_printable_booklet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613fe489-5bd2-48bc-ba17-32f80f14c225/manual_of_standard_tibetan_language_and_civilization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f148449-be86-4a58-a87c-f148763b6aaf/26177493909.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/full_free_movie_the_twilight_saga_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/landscape_lighting_planning_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/92747971741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9192c338-9151-4ce4-9996-d5c347105629/academic_strengths_examples_iep.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_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 5512 bytes
SHA-256: 142e1f51c35f9c63901d74e4ba22cc01546ce99958b4cb2a5d8a814df4ee59d3
font_01_sfnt_off000130f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F9 12268 bytes
SHA-256: 7fc40ad23cda8530c0888c4067a4569c2c6c69746c4035b7a236393588fa7d0c

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