Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64c5bab51a6fce5…

MALICIOUS

PDF

77.5 KB Created: 2021-01-08 16:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3efcb344209e515fa1c9e1904455ceca SHA-1: 95d268cb244ea9b7eb6582ba7bfdaac9546b7701 SHA-256: b64c5bab51a6fce5b528c4b49b7f384888ccf3d3f9e5602373a23f046ddd7a7e
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a phone number, characteristic of callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile point towards a phishing or social engineering attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=brandenburg+concerto+3+violin+sheet+music PDF link annotation
    • https://cdn.sqhk.co/munakuvu/hgoibii/58427908816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424981/normal_5fc7e50c0e081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5fb02d5034317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5f8d119b36653.pdfIn PDF document text
    • https://dixoparogazasa.weebly.com/uploads/1/3/1/8/131871726/sopoz.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/6437483.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/5444952.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/J2MhjMo/warren_buffett_house_security.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/QibwfSi/98482458552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fd699562e459.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/77e73622-d34a-42c9-96f0-55176ffa0b91/xonidutokaxobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e94abf0-4b78-4b07-bd5f-1f9a4969812e/cara_mendidik_anak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 5768 bytes
SHA-256: 90afa4cad57bce5b26572070f805b6cfb1cf9a3731eb25b7306dde7d38ddd646
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 12668 bytes
SHA-256: 7215ecd31282e91aca366137aa50af063dccd4975e93cbde28eb857d11d36539
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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