Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd0dda47ece864…

MALICIOUS

PDF

75.1 KB Created: 2021-01-03 10:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25d7305718b07030ef713aebbf61da88 SHA-1: 1d6d5abd2f045344de11019954c0c8c2069fb711 SHA-256: 91cd0dda47ece864994aa8477e1174747fdac7763fb117a97057e8960c7e9dfb
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document employs a social engineering lure, instructing the user to install a browser extension or plugin to view content, which is a common tactic for malware installation. An external URI was also extracted, potentially for payload delivery.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://traffnew.ru/123?utm_term=cash+app+verification+log PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485446/normal_5fa833f0920aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_5fbdfb86c0358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408340/normal_5fc7fbcb4f9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5fbedeff1adf9.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/jdrKxgi/soft_skills_for_effective_interpersonal_communication_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fe7d0e8c5dc7.pdfIn 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/9b73273b-befd-48a3-a59f-395e14c0e662/pencil_sketch_drawing_images_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f27fc2-11c9-42f4-a340-28153a3d2c2d/devetuwonaramu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda9297a-54ad-4925-b770-e06edfb78718/the_essays_of_warren_buffett_lessons_for_corporate_america_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/79752398038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b717c263-2c51-4b57-9e73-a196827642a0/bamaja.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
stream_004_off0000fb04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB04 10916 bytes
SHA-256: 689c227083fbcf21e3b42deeeaeae244e1441c5c120b2d4b8e7405b32de4e13a
font_00_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 5240 bytes
SHA-256: 0bc354ad0e7e8568c0481e3bad58938ccde521a49b178dad885fb7e4159c97e6

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