Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e30a6df50ca9c5…

MALICIOUS

PDF

87.3 KB Created: 2021-05-22 10:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 480f63d5e11a5ec5062ec0bd049d5a44 SHA-1: e187e6788a95de1f90e6ddbaa7b9521cb08b8a7f SHA-256: 31e30a6df50ca9c5a6d252d7e83d494057a0448cfd5ef1668233128c8a44f485
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to other PDFs, suggesting a link farm designed to manipulate search engine results. The primary malicious URL identified is vilenefex.ru, which is likely used to host phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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/strik?utm_term=which+is+the+best+free+video+editing+app PDF link annotation
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/094483e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_604d86b74134c.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/59c3861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_6048c17e370be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_605f7d7da43d9.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/0bc18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_6057f881e45fe.pdfIn PDF document text
    • https://muxuxinipizo.weebly.com/uploads/1/3/1/6/131637853/mebageno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fe496de950c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_6052cf92a2c15.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/ac0659a8-412e-4c37-bd42-53b601e7268c/muwasozepolup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de639a2-a6f5-4d22-b04a-d3129ef8e684/52177146126.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/anodized_aluminium_sheets_hs_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea14f578-35df-47cb-aaae-c53a2c095ce7/navien_npe-240s_error_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/86294768044.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/microbiology_mcq_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/41869469229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e08fba-0a55-4bb9-bb1d-3bd69c1e48a5/33940006751.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/marketing_plan_presentation_slide_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/cession_de_formation_bafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18c1403-af42-44ab-a268-2433902ee7f8/whats_the_best_55_inch_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/wararifisanal.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/lorofevuxokabipag.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/20357849865.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/cvc_words_with_pictures_free.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_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 5596 bytes
SHA-256: c18f203bbeb6e8c282d2c75caa257ce44eb2400bf52d313b2ad43937d751041b
font_01_sfnt_off00012b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 10592 bytes
SHA-256: 0822d720af0b23b6e2a11343024bbc31055391977baddeb454952bd1e9d5cb9e

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