Malicious PDF — malware analysis report

Static analysis result for SHA-256 5875dbe83fa903a5…

MALICIOUS

PDF

79.2 KB Created: 2021-03-27 10:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1f883347891a82a2f0c8a95c2d43b53 SHA-1: 52942b830a6a53da948aadb9a0a98b94015aa205 SHA-256: 5875dbe83fa903a5a373af32d894e69c4d9379bf1377f7546ec7ce5771998367
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 suspicious domains and are designed to appear as SEO-optimized content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=what+is+unbearable+lightness+of+being
    • http://characduwe.space/how_to_reset_bosch_classixx_washing_machinei5ukt.pdf
    • http://fitness1.space/a_lesson_before_dying_chapter_18ecbdv.pdf
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/jatejorew.pdf
    • http://lady-bug.club/safety_procedures_in_using_hand_tools_and_equipment_in_computer_hardware_servicing_pptxo87s.pdf
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/suxupabukut.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe4238c5195a.pdf
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/b4445f45.pdf
    • https://static.s123-cdn-static.com/uploads/4385437/normal_60062361ef618.pdf
    • https://cdn-cms.f-static.net/uploads/4392667/normal_6026394e0d1b6.pdf
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/vevigumabof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/risisipajole/59569785199.pdf
    • https://s3.amazonaws.com/xunilukegez/cascanueces_alejandro_dumas.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/92181664440.pdf
    • https://s3.amazonaws.com/wobuzisibal/gezajegoke.pdf
    • https://uploads.strikinglycdn.com/files/2feb73f9-277c-436a-98a7-18338294d2ba/free_advanced_origami_diagrams.pdf
    • https://s3.amazonaws.com/jirebonudur/what_is_the_full_form_of_millet.pdf
    • https://s3.amazonaws.com/wovugi/jipinilizalojiwogizut.pdf
    • https://uploads.strikinglycdn.com/files/8480dd4f-e8ff-4464-9b94-e670f0f5f67f/how_much_does_it_cost_to_get_certified_for_eyelash_extensions.pdf
    • https://uploads.strikinglycdn.com/files/6e064206-84b9-4ca2-9989-0b6f029962c6/miratetusafenituzetoviv.pdf
    • https://uploads.strikinglycdn.com/files/3a8be0a7-215b-4fe0-b192-5ff3a770a4fc/372034013.pdf
    • https://uploads.strikinglycdn.com/files/2f373be6-2736-4d59-a6b6-53732055fa3d/kubota_d1105-ef02_service_manual.pdf
    • https://s3.amazonaws.com/wazotojemov/43532028029.pdf
    • https://s3.amazonaws.com/paxuvagal/arma_3_fallujah_map.pdf
    • https://s3.amazonaws.com/falufusu/hard_math_riddles_with_answers.pdf
    • https://s3.amazonaws.com/tanikanaw/c._m._e._srl_formigine.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_off0000f679.bin
367a01f4a48d8cf0f3e57cfaed23b5c6e6d2e03b76402f3b54765a1dd3621a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5184 bytes
font_01_sfnt_off00010823.bin
ad874fd7a67d2e4c12e6574824398ef06bf3c825cf7946dc30d6dedbf76ae3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 12240 bytes

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