Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ffa4abca32e48…

MALICIOUS

PDF

72.4 KB Created: 2021-01-08 19:24:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0841501e649a41f31b88247d2033dd8b SHA-1: 2e4f0bacd98e35effb26f77aa029149e97a40559 SHA-256: f91ffa4abca32e481bd665f924a04a29a4ab0b1dc0a8cd2188ec34e3cd7b43ac
164 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating a fake CAPTCHA lure and an external URI pointing to a suspicious domain, likely intended to trick users into clicking a link. The document body, though heavily obfuscated, contains text related to 'exceed money network pay stub portal', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffset.ru/wb?keyword=exceed%20money%20network%20pay%20stub%20portal PDF link annotation
    • https://cdn.sqhk.co/joxomawezu/ghfJC9U/social_intelligence_book_daniel_goleman.pdfIn PDF document text
    • https://cdn.sqhk.co/develezuwa/icCggvP/zefudufovixosibiful.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/felasorarabipis/fominekukuvonokaginimiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2092d1bf-183d-4c7c-b123-a17f3f07fdcc/tetebopagunomasikemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45099273-882d-4cda-ab94-31c4234c4485/paragraph_writing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031a235f-4976-4a4e-868f-5fc28c533dc3/72546108613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358c8676-72b6-40b7-83df-c5086ad96517/78814599103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54c04fa-9c27-4eef-9ed2-02b8fcaadb5c/52888866069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b031243-5835-43a8-a050-e26dd5b7ee51/the_used_discography.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/rpg_maker_mv_android_controls.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/descubre_1_workbook_answers_leccion_8.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/boat_trailer_bill_of_sale_template_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed434b2-dbcd-4a9a-b48a-ef927db42b73/13347425617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669947f4-5983-42ae-97cb-5959ae60e590/zisid.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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 5640 bytes
SHA-256: 6b285d95d671d42c0b32d3112efbde57772c334763642c31e3d58232fff3b407
font_01_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 11268 bytes
SHA-256: c558d75e8c4dde8a75a102f259ea59ed0e81e9c18cceb47626943dadaaea6d6b

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