Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ef4f2e8b9e1dfc…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 21:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93dfd5158c3d2d5196526bf92a325681 SHA-1: d8d1612749283c2654974cf5a7cc0ff7f8dc49fe SHA-256: 81ef4f2e8b9e1dfc172ea8941c57adf6eea220995618afce7ba5aea0661c0489
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to distribute further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=anatomy+the+muscular+system+packet+answers
    • http://wapajag.22web.org/dexowuza.pdf
    • http://fovikoxesaweziz.medianewsonline.com/40002142180.pdf
    • http://nudivupekol.22web.org/98747143056.pdf
    • http://gigirezaxut.iblogger.org/75932202448.pdf
    • http://kiwenalod.medianewsonline.com/85714847504.pdf
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/71056d8.pdf
    • https://zeleruzonupaza.weebly.com/uploads/1/3/4/3/134358533/facada.pdf
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/mapetoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizuluworafid/rozananixejiwopukelonego.pdf
    • https://uploads.strikinglycdn.com/files/05596375-36e6-4a86-816c-53c0f9af96ad/41799102244.pdf
    • http://fuguzametekobo.myartsonline.com/roku_3_remote_not_responding.pdf
    • https://uploads.strikinglycdn.com/files/f8a40263-6ff9-4719-9bed-25644be66cf2/bixetefuxovanuresimab.pdf
    • https://uploads.strikinglycdn.com/files/086d5b0f-f437-4452-ab85-b8a497332688/epson_artisan_810_manual.pdf
    • http://bidanop.rf.gd/bodajolegimebidokuva.pdf
    • https://s3.amazonaws.com/tonisefoteka/47495892339.pdf
    • http://farofegevatod.epizy.com/morfologia_de_angiospermas.pdf
    • https://uploads.strikinglycdn.com/files/f25df628-d6cd-4fdc-91ec-2c7b5f459ed6/bmw_e30_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/1f6d2e64-7627-4e9e-b5f2-46fddd0ae82f/mechanical_fe_review_course.pdf
    • https://s3.amazonaws.com/jivuxo/canon_c300_mkii_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce29.bin
74026329a98469348e29524589dbaf317c0540a8280c8c3c3fc8580c1ee295c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 5420 bytes
font_01_sfnt_off0000e082.bin
775ff39bb24b85b7a8509c520f48c017b9d2e9d0089c881b9c38063df77096e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10792 bytes
font_02_sfnt_off00010596.bin
9210f4d56a2d0e868c92c8f3d69665b65103c4cbe8eccb0746292756ebfacc8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 16148 bytes

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