Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9463429152dd08…

MALICIOUS

PDF

72.8 KB Created: 2021-04-16 17:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ff8ab94adbd2ce769e8a5beeb0b0923 SHA-1: 6ed5128a7eb426ddc1220bd7690dc50baf3ea159 SHA-256: 8a9463429152dd08691aeb384ab9d87c2206daf9f01c5253e4083c198466a60c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=endocrine+system+concept+map+pdf PDF link annotation
    • http://ributufukepun.66ghz.com/44990394913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_606222c90c50c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446915/normal_5fcca7c5010c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_602cade139bec.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/construct_2_multiplayer_sync_variable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6011f177ee93a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_60527a1457c9b.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/bicentenario_del_peru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60229d5cd6cbf.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/6bb19be8-e549-4fca-afce-0edad5db908e/35750478896.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_0083f324dca14077aab384dcdc7889a7.pdf?index=trueIn PDF document text
    • http://wewiligeva.epizy.com/how_to_update_kenwood_navigation_system.pdfIn PDF document text
    • http://wezegene.rf.gd/72098904133.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_f927a039106a46bca6df6f36ad56b0c9.pdf?index=trueIn PDF document text
    • http://lawuzuzadi.rf.gd/garis_besar_sejarah_amerika_serikat.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_843fe67553b44dbf9644e10c1421853d.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_47f207717ef54646bb671a6512dff29f.pdf?index=trueIn PDF document text
    • http://gaxezakowe.epizy.com/3d_video_for_android_mobile.pdfIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_52919f997cad49a9b1e071d1571f6076.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f20756e-306f-4772-9b24-d8e0e267a263/70649233711.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
font_00_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5328 bytes
SHA-256: 88062f3a7849e32f510172626e5ba83f2758e25186d76d32cee39db52ee56e49
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10388 bytes
SHA-256: 595d334d922951226b7498fa8e5ea856cf7dae79b009df21a9c705a9f7bf0954

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