Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef60a2f241e67245…

MALICIOUS

PDF

78.3 KB Created: 2021-05-25 10:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e1f42d5e1edc8eed0174cced1dbb65a SHA-1: 2ee35456e6b4d3e9769f16e8838778e37e966cef SHA-256: ef60a2f241e67245800dbd6e2b3627b96c8cb43f9af309d8c79270ad3c8366a2
156 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 of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=sq8+mini+dv+camera+manuale+italiano
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/846981f8724e4.pdf
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/koxawakajilixug-pafijibetapepi-zimubeminix.pdf
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/dafexu.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fd641775841a.pdf
    • https://static.s123-cdn-static.com/uploads/4483604/normal_6002fb491ba5c.pdf
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/liwatojivotosex.pdf
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6019b9c3715d1.pdf
    • https://fugunizowad.weebly.com/uploads/1/3/4/3/134364761/1925164.pdf
    • https://xugowumilivave.weebly.com/uploads/1/3/4/8/134846580/tizefipos.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/1784530.pdf
    • https://cdn-cms.f-static.net/uploads/4461770/normal_606b09e25419a.pdf
    • https://mepovokure.weebly.com/uploads/1/3/0/9/130969824/gigiganopesa.pdf
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/davigaxoreb.pdf
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/1951352.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81180497-c269-495c-bd1b-bf1ee25f8ebb/16288517870.pdf
    • https://uploads.strikinglycdn.com/files/9e38e049-7c43-42ea-8708-222b17112018/dominos_pizza_ingredients_australia.pdf
    • https://uploads.strikinglycdn.com/files/915700c3-2113-4124-baa9-f3476d219b09/ariens_520_snowblower_belt.pdf
    • https://uploads.strikinglycdn.com/files/21426ea9-5634-4298-9213-030fc4df6929/nibafaxosekubud.pdf
    • https://uploads.strikinglycdn.com/files/8c077224-995b-47f0-9519-5aa6a6a8b869/viwojijif.pdf
    • https://uploads.strikinglycdn.com/files/366b3785-f3b0-49bc-9fae-733a43850afe/what_is_the_story_the_rocking_horse_winner_about.pdf
    • 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_off0000f314.bin
e78e6c6b8ecebdd04808fd8ab5a18217df0e9bd4cc4298986f2dad9160cdb85f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 5388 bytes
font_01_sfnt_off00010555.bin
db4fb89414e180f9b2c21b5f4ffa406c92a4a7f9f0901b3901508bba3650161f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 11316 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.