Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb93e7724f38f33…

MALICIOUS

PDF

91.5 KB Created: 2021-03-24 01:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e56bc174198dd725ed651249687027fa SHA-1: 05f830e0607911249167a00d547fdca6c45ea396 SHA-256: 4fb93e7724f38f33bdbf1ce2e8a40f8740dd83006fe9b8331cf77c1c0a4ea658
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'ponafet.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Malware.Agent-9978897-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9978897-0
  • 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://ponafet.ru/123?utm_term=autodesk+vault+basic+server+2015 PDF link annotation
    • https://wagizubim.weebly.com/uploads/1/3/4/4/134470033/45c84309b.pdfIn PDF document text
    • http://kalanuso.iblogger.org/graphic_organizers_for_math.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/physical_and_biological_soil_and_water_conservation_measures.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/tuzujevu.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/4296772.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/nijamamolamiraxatukifoxa.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/51232025810.pdfIn PDF document text
    • http://gitikevajup.iblogger.org/kawunoba.pdfIn PDF document text
    • https://jutamuxenaritul.weebly.com/uploads/1/3/1/4/131452982/2d9a6619502d89.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/jubilizakonesidixed.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ZKvifie/greenlots_contact_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/jjeA3he/gem_miner_game_online.pdfIn PDF document text
    • https://vusasetimonumak.weebly.com/uploads/1/3/4/8/134855164/5520687.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/80f20fdd-fd8c-4974-bbf8-7e04ec026017/spelljammer_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70bce7e4-6db4-420f-aad8-7d4cb22fd5ce/euro_truck_simulator_2_keyboard_keys.pdfIn PDF document text
    • http://daraxelasapok.rf.gd/85161800019.pdfIn PDF document text
    • http://finabijilovob.rf.gd/dengue_hemorrhagic_fever_who_guidelines_2011.pdfIn PDF document text
    • http://sedoguzod.rf.gd/steins_gate_0_endings_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629bcafb-b17a-4281-a0af-8119603aee1c/what_are_all_the_negative_emotions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deafa009-2ed2-4d1a-b83a-dc36710c601e/witogabevonopikije.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_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 5636 bytes
SHA-256: 7e7ee1a829fdd05eea023966dbdac7c41cb3204f5f97c098ecdc4c55b9e3bc96
font_01_sfnt_off000139a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A1 10988 bytes
SHA-256: bf33d173f44d13ec857aec9047ed2784b91c197b1d1d4690d72e98c969607c3e

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