Malicious PDF — malware analysis report

Static analysis result for SHA-256 779c465d2ff4dd91…

MALICIOUS

PDF

84.2 KB Created: 2021-05-13 23:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70dcc16f4671c9d90428b30b76f380c2 SHA-1: 5c5b242792d9e8a6c7554959de242bf3eefabbf9 SHA-256: 779c465d2ff4dd917a6a38e57addf3549d06f2c16d21f4ada635a719e528512f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and a link farm on disposable hosting suggests an attempt to redirect users to malicious sites, potentially for malware distribution or credential harvesting.

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://xezojetit.ru/strik?utm_term=tcp%252Fip+model+vs+osi+model+pdf PDF link annotation
    • http://on-arenas.com/nefivepujif0ec9c.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/2745025.pdfIn PDF document text
    • http://levitajagukog.scienceontheweb.net/ciencias_formales_libro.pdfIn PDF document text
    • http://kifowiwesujuwil.iblogger.org/79946488376.pdfIn PDF document text
    • http://detonic-ufficiale.website/jezavopaleysne.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/dell_ax510_wired_computer_speaker_sound_barxwwvk.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/gipizupematozosadan.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/ed620656-b2bc-4881-bc4a-7d40ac928b8c/tefatolujuw.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_173aeef7f3274f8fb7c2818084e98385.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_6adbfa9f5a784481b01874c47eb3319e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cb0a4b-e9b7-4714-8270-5b3768e70a2f/25444939360.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/22329611204.pdfIn PDF document text
    • http://sazitoza.epizy.com/547541103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6629fc7f-bf71-479d-bab1-05474915ceb1/killing_joke_batman_comic_online.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_c21dc66e4cfe485185d3475624133073.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_b09ba6ff7b434d06b6b463dc8fe5aae4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 5040 bytes
SHA-256: 29fca590ed923f2d49e5a5e428a6725d3e474aadc7a5a896d81301d8b616f0e9
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 11288 bytes
SHA-256: cc46b5bfdab24a1147f25c9f20f9fa05347b6b490c6081e3853dade7d25a3f59

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