Malicious PDF — malware analysis report

Static analysis result for SHA-256 83485bcdeb6e4155…

MALICIOUS

PDF

90.9 KB Created: 2021-03-31 08:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aae85427c3ef1b857db8792be1901f4e SHA-1: 1eeee4014b5c95ba926c71b37b496068d6dfb704 SHA-256: 83485bcdeb6e4155a65ba1651e9ee433cbcffe2e6e4759bf6e1ab1c49b4fdb5b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit user curiosity.

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://mezovuduw.ru/aws?utm_term=pride+and+prejudice+2005+full+movie+watch+online
    • https://cdn-cms.f-static.net/uploads/4489975/normal_601d9f5d1e4f8.pdf
    • http://lotukaguw.sportsontheweb.net/xamomasixipoxavakenesi.pdf
    • http://garobunatuxovi.scienceontheweb.net/80165217851.pdf
    • http://vazagitomis.mypressonline.com/bienestar_psicologico_en_el_adulto_mayor.pdf
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fe061f9792d9.pdf
    • https://cdn-cms.f-static.net/uploads/4382429/normal_6057fde87e919.pdf
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ffc13f4dfb62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_eb7dd68a6f8442ce8229532628392ac4.pdf?index=true
    • http://durenifujogax.myartsonline.com/sexafetuxegegukenek.pdf
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_2df888d4ab3e42fb8b293634fb2f485d.pdf?index=true
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_f368a88f28c34a3fa33a99f0fc3ab91f.pdf?index=true
    • https://34a711a6-6b77-41b4-a6d5-f55437226814.filesusr.com/ugd/c1ce8b_1e3015dac8f24577afa9902f8124e93d.pdf?index=true
    • http://tesoravibeje.epizy.com/why_was_the_graveyard_book_banned.pdf
    • https://uploads.strikinglycdn.com/files/df6fa069-b572-4faf-a442-81eaea18050c/who_were_the_members_of_the_first_two_estates.pdf
    • https://uploads.strikinglycdn.com/files/1801e5ed-c561-4be7-bf55-e94255b47013/big_nate_blasts_off_book.pdf
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_6e2f333b10434223be7c5005dd8997bc.pdf?index=true
    • http://vudubarexofibuf.rf.gd/zoxagatisatame.pdf
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_74e6b7875fe34196bb7d51ae47fa739c.pdf?index=true
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_5e4d0a90539e40b488139f78cba6d4b6.pdf?index=true
    • http://jexamovofu.epizy.com/dopugosi.pdf
    • http://jitawidavez.atwebpages.com/free_abc_tracing_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/7070314d-20eb-4c0c-a565-e66da417ac4d/how_many_watts_is_the_lg_smart_inverter_microwave.pdf
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_f0de1c26cf0c4f95afbc94ee07b72aba.pdf?index=true
    • 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_off000124e4.bin
4745a776c40822f221312b28d1948bf8f97a6927c0418f0a9f3fec09ded58c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 5844 bytes
font_01_sfnt_off000138c5.bin
f07228c6fba8918bc7193c7be96b41e8c0de04bf138ce2bc2f16e6ee2a541066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 10912 bytes

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