Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a7c77b8e52de4b…

MALICIOUS

PDF

80.5 KB Created: 2021-04-26 18:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73972e6faf4a68b01c63cd5855d6a301 SHA-1: 1b803582046316b8a2cfeb25979b9a3da46adb20 SHA-256: 76a7c77b8e52de4b913f257dbb7e72e98e337594bf7c265066a4f35d8a63ee87
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded URLs point to various PDF documents, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://crophysi.ru/strik?utm_term=altec+lansing+boom+jacket+2+watts
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/3a8b0ede0.pdf
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/3116868.pdf
    • https://fogenidu.weebly.com/uploads/1/3/4/3/134391000/3271431.pdf
    • https://cdn.sqhk.co/mutexeze/PUbSjeM/race_time_predictor_garmin.pdf
    • https://cdn.sqhk.co/derepinejabi/ibieBtG/premier_league_fantasy_gameweek.pdf
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/2497865.pdf
    • https://cdn-cms.f-static.net/uploads/4486537/normal_60258e8df262f.pdf
    • https://cdn.sqhk.co/juselivo/fkie7jh/zed_runes_urf.pdf
    • https://nonoxatuvel.weebly.com/uploads/1/3/2/6/132681685/voxerobekilipa.pdf
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/9d76c3d6462.pdf
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdf
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/woxiz-mavewukovit-ximeraju.pdf
    • https://static.s123-cdn-static.com/uploads/4461495/normal_60064b60f19de.pdf
    • https://cdn.sqhk.co/dokukavifig/hQ3dFid/pubidalujole.pdf
    • https://gebekogekikak.weebly.com/uploads/1/3/4/6/134694855/0df559a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02bcedf2-a104-44d9-85ee-c7e691c726fb/how_to_interpret_vif_output_in_r.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_16eac7d0c1ba4c039d30ce99fa4adf60.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_0f20266d8c434d42bcdc30bd2efe5904.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_7786fefdf28749d8ac30096a50120d8d.pdf?index=true
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_a9aa05d7b2cc46d7b347bb788ced68ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e94c3a96-11f1-4d59-b18f-43bd4dfcce29/nononidudujoruked.pdf
    • https://uploads.strikinglycdn.com/files/43b039fa-3422-41b9-8739-d4c7cccf5e91/how_to_use_symbols_on_dymo_letratag_xr.pdf
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_5cc61b4965764d21918b71b7743f4254.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_off0000f83a.bin
600e9504efd871ad1397631b89ea7fa470470b8baaf3e7669d87c545cd0e95bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 5516 bytes
font_01_sfnt_off00010b09.bin
6cda11f9f51ba4534cf636786d63d4e5fd6feacc4fabc79890efa154f537accd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 12452 bytes

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