Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5c15bef0d95402…

MALICIOUS

PDF

72.9 KB Created: 2021-03-15 16:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20deb164bfb1a73c32ec07ac37dfacda SHA-1: 2c3d810fd569f0be1afcbc6314c45ade465b6dea SHA-256: 4d5c15bef0d9540269472dfbc244d596543352303ab19fd3fc58f90704498df2
156 Risk Score

Malware Insights

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

The PDF file, disguised as a certificate of employment, contains a large number of external links, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=certificate+of+employment+sample+letter+pdf
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/fa8fd73df3.pdf
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/9256155.pdf
    • https://cdn.sqhk.co/businaxidare/0nELMbV/japasejekiboreratisaja.pdf
    • http://tersq.space/officiant_wedding_ceremony_script_funnykdqkw.pdf
    • https://jipedopifuxo.weebly.com/uploads/1/3/4/0/134042804/b7abc8.pdf
    • https://cdn.sqhk.co/mewuxedodi/cibghjV/amazon_prime_video_customer_service_canada.pdf
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/4cd1cbb86ea.pdf
    • http://getcreditreport.info/11050811882c8gp0.pdf
    • https://cdn.sqhk.co/tiwumixe/ij7t7jf/pevojalomipifaw.pdf
    • https://patodenum.weebly.com/uploads/1/3/4/6/134657208/1512913.pdf
    • http://phulop.store/boone_and_crockett_elk_scoring_guiderhcd2.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/9403694.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/zafiwaxeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_cc398462345141b0a4029ff814057a02.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_a5a34ca1f6dc412ba267f499356d2746.pdf?index=true
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_ba5de6321b1744b192ee1ee3a9e9846a.pdf?index=true
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_53ee1d973c4f425cacef863263fd7026.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_6b039f279e9a44aa8706960d43d818cb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e144.bin
4da9f08dc48f01943cc610b998135f9358d45c88ef539772f9bef1f86986699e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5308 bytes
font_01_sfnt_off0000f343.bin
0b1497a342bb20c39a84de12795e297eb92815b5c63ea4cbf9d8da39d5e6d297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10228 bytes

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