Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fe0747e4b54aea…

MALICIOUS

PDF

79.9 KB Created: 2021-04-26 20:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 06ed07275df9dea32ff1c3e9334e14c5 SHA-1: faf0fe1d5b0eaa436a11c237c9379be9c0a4b344 SHA-256: 99fe0747e4b54aeae27ae675a8dc85320a0058958039fe00364375f6044ede09
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or further malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

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://seumenha.ru/strik?utm_term=surface+area+of+cylinders+cones+and+spheres+worksheet+answers PDF link annotation
    • http://robertferrell.net/survival_kit_list_and_uses_for_earthquake5v65d.pdfIn PDF document text
    • https://mujavipaw.weebly.com/uploads/1/3/0/8/130874121/5873359.pdfIn PDF document text
    • http://bugakesebe.iblogger.org/emergency_room_physician_salary_michigan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6015f56627e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6039767b748a9.pdfIn PDF document text
    • http://neduxafeferik.iblogger.org/surah_al_waqiah_suara_merdu.pdfIn PDF document text
    • http://lofitner.buzz/forul39mka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5ff01f2a73d93.pdfIn PDF document text
    • http://parralax.net/virginia_house_of_burgesses_worksheet_answersxqd1x.pdfIn PDF document text
    • https://zinalojirade.weebly.com/uploads/1/3/4/2/134266028/zeber-jonuvamoro-wivowota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodijab.epizy.com/79559091566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1709c8bc-a858-4358-bce7-edbef68c0286/how_to_use_ge_washer_and_dryer_combo.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_9cc38c6766974ebfa4b83a0c9e5fad4e.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_323ccf94fd0a4848ab5639d037019d77.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_4db20338bca74494a2310de03695c9ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12b8466-68b3-4590-869e-d828313710a6/sims_3_cc_skinny_jeans.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_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 5604 bytes
SHA-256: c087ae0d99d1f634ca798dc32a9e4ab09b4f84b4be01e1b898fef5e31cdbf01a
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 11768 bytes
SHA-256: 6d9d9cc23927f9875047fd23e820edd589ace20e9c28c71eb23d511e07c71fd3

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