Malicious PDF — malware analysis report

Static analysis result for SHA-256 f592a8d6ec247a5d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-16 13:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8956bae4be1416c4b1aa1859fef64146 SHA-1: 4454431558ec8914c5f563f804b50210f873aff7 SHA-256: f592a8d6ec247a5daef8624be4c8cff6ff356f17a64b1e9043b25d19a638d786
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://dugedepap.ru/strik. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=lenin+and+philosophy+and+other+essays+pdf
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/xetulapajofo_nokobe.pdf
    • https://porokademapu.weebly.com/uploads/1/3/4/9/134901730/liwokepivup_vevitazisisumag.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/tuwefitezowu.pdf
    • http://julivojurukumu.sportsontheweb.net/atlas_copco_compressors_charlotte_nc.pdf
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/136ae46770a5b0.pdf
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/983871d66723b.pdf
    • https://supadebev.weebly.com/uploads/1/3/2/7/132712355/silavigo_wonuwatawoj_gaveko.pdf
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/vujibafonenelopirod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibubatovavav.atwebpages.com/craftsman_chainsaw_manual.pdf
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_962c4733718d4204890359451e97b1b1.pdf?index=true
    • http://gevejonitu.onlinewebshop.net/what_does_the_bible_say_about_jobs_wife.pdf
    • https://uploads.strikinglycdn.com/files/634aca59-f5f0-4d87-8de0-09538c39ffbd/roku_3810r_walmart.pdf
    • https://uploads.strikinglycdn.com/files/f2c82bc2-6913-4a19-a3b4-3c7e17653b85/what_are_the_five_senses_called.pdf
    • https://uploads.strikinglycdn.com/files/0abcab14-f031-4fea-a8b4-b8d96f4f9c2b/45483710160.pdf
    • http://tiwatimab.atwebpages.com/21351886798.pdf
    • https://uploads.strikinglycdn.com/files/2a27cb4f-5792-4450-af97-8aae3f3065a5/fejutivufimilopi.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_6100bfda33184f29bf27ae70ed580ac5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e5bb9d9-0e16-45a3-b249-c20bf200bac9/great_by_choice.pdf
    • http://sasaxunofob.atwebpages.com/pandora_s_box_story_ks2.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_934b00e4de484df1b6cdc1b4e2075fbc.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_off0000f197.bin
1e2760e59a0bf81caf7c511771e3f070d7c97e601117f83995ebccc80335e72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5172 bytes
font_01_sfnt_off00010330.bin
29f1157f9dd7e18d0746ba6df009f973f579c76b4a92682666edb4f8008d1da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10712 bytes

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