Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66325a84edc769f…

MALICIOUS

PDF

87.4 KB Created: 2021-03-19 17:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ee4eec49269de7dc02fd923f5c39695 SHA-1: db59bcdc8a8fc7fc9ec9e80bfb4268f7f854f460 SHA-256: d66325a84edc769f1ac16f345e32a650878728a7fd2b87715b6e7329926751e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=animal+pen+size+minecraft
    • http://ig-socialmedia.xyz/anesthesiologist_physician_salaryro9q6.pdf
    • https://julixejim.weebly.com/uploads/1/3/5/3/135393951/9393543.pdf
    • http://busforpay.online/how_much_does_colonel_in_air_force_makero323.pdf
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/720130ff9a5e.pdf
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/9522156.pdf
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/sukanudevuroba-zotesoxoku-fajazupa-jezisuwewugogaf.pdf
    • http://slmit.space/950876734934kh77.pdf
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/linulowax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_4bd95b8373ef43278db1edc462d588e3.pdf?index=true
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_6202c6fb9bb04543a8afeb092eccb862.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_a14f868877e847ddb85df9c01131b7af.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_71efb1b15bad40b088f618b5fa8bd7a4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb50c401-0632-4f35-b6e8-74dd0eda1f34/livros_em_ingles_infantil.pdf
    • https://uploads.strikinglycdn.com/files/aa2217d2-bf13-47d9-98c8-12b0c1239791/mendota_fireplace_price_list.pdf
    • https://uploads.strikinglycdn.com/files/87eefa20-7d7f-453c-8296-204a735d9710/zibetodimolisizugu.pdf
    • https://uploads.strikinglycdn.com/files/5f9f321f-4f33-4454-989f-7e8737b8fbad/53423849478.pdf
    • https://uploads.strikinglycdn.com/files/be625908-bfcf-40ee-b338-3e32d4c08b02/reading_comprehension_exercises_for_grade_6.pdf
    • https://uploads.strikinglycdn.com/files/8c46cbde-3a2d-4268-8ae8-ceb3a72e784d/kajaki.pdf
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_c5b2429bfb424cd09f6a58c140024ab5.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_4008ddf4b43f48248e4af33d07affc04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0eb37a6-5a2b-4d79-8cb5-6a2036f73389/pemodawobinovunu.pdf
    • 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_off0001181d.bin
4a87e5c3acff7adfbc295063059dd1e9002097aab483bb2996f985cc6d8d4c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 5200 bytes
font_01_sfnt_off000129bc.bin
cc1803a9259c483f4c3853bf002de115721bb0704b13eeaa61caf9549ef50dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 11292 bytes

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