Malicious PDF — malware analysis report

Static analysis result for SHA-256 125a185682b6ec97…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 03:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9f877019fc5a300099c401700492a01a SHA-1: 61f8249e8223e4f99bd4d30e83e3b6ce96923d9e SHA-256: 125a185682b6ec97e0a923effffa82089548ef662e93aaff14b80c79b8623525
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://vilenefex.ru/award?keyword=metal+cutting+machine+tools+lab+manual+pdf. The document's structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/award?keyword=metal+cutting+machine+tools+lab+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/fudamozomeb/jgZdEvs/wafodetinifufotanega.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/fuwibizomutixale.pdfIn PDF document text
    • http://cetakchantek.com/grammar_for_ielts_writing_task_2_liz_free_downloadwawz0.pdfIn PDF document text
    • https://jojuvuzi.weebly.com/uploads/1/3/1/8/131871720/9389293.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/idJh9ca/calendar_2021_january_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/ghPCwij/69000214502.pdfIn PDF document text
    • http://latencfsrt.space/watodx7edm.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/8e6afcd1-4709-43ec-a236-1fd221bf4bd1/22343591435.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b63f1b64caa94433b3c5132ace9cff55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c331bbd7-581c-4fa4-8957-d96e1a76cf7f/as_bill_sees_it_fear.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_a7982bc4e62c4ad2b269aa2ee02961e7.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_3b71f61f0bfb4c7db39aceb0b08d263a.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_4760123c2bb34030aaa5f69942eec774.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be26f426-7c32-43af-b20c-da3d41bfee92/members_mark_grill_burner_covers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c02fd5-673c-4f93-8f43-ff35cefc2df6/hp_deskjet_2620_ink_cartridge_replacement.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_2a7d0dec12f346538eac186e5303c94a.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_3d11cb93b25b4aa3bc10e3ddd11f73e4.pdf?index=trueIn 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_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5616 bytes
SHA-256: 3ecd55622fb7242ceb966f45f3a7dcc86e25d4b5b645b49e5c28892a5500e422
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 11160 bytes
SHA-256: b1386aebe3017b555b136957b1d9489f6e65599bc12bf4ca80e3a0e3c52fd70c

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