Malicious PDF — malware analysis report

Static analysis result for SHA-256 0227b362461a8608…

MALICIOUS

PDF

75.5 KB Created: 2021-06-11 13:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e860b40d2b7853f96f34cf5f9ecbabd2 SHA-1: 0f9d814d10d5eafd93e29a77b5e72534c7e3727a SHA-256: 0227b362461a8608151a18fa04b795ea2fdf4fc8becc9420bef74ea11ebfc6eb
164 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. The PDF contains a mass external link farm, with one notable URL being https://ketchas.ru/pbw?utm_term=vygotsky%2527s+cognitive+theory. This suggests the document is likely part of a phishing or SEO manipulation campaign, aiming to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/pbw?utm_term=vygotsky%2527s+cognitive+theory
    • https://sigudajofabi.weebly.com/uploads/1/3/4/6/134679089/8995656.pdf
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/5b4bb6.pdf
    • https://wuwejinetuna.weebly.com/uploads/1/3/2/6/132681176/5728162.pdf
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/rutisinosafipe_topejobosovir_wogoxugumasuni.pdf
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/6888683.pdf
    • https://sutikarojujo.weebly.com/uploads/1/3/4/3/134343437/d6d0daf8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52c86b3b-ab18-489c-8a83-f10c194c66e1/uniden_bc355n_digital.pdf
    • http://mukibilevejo.pbworks.com/f/88175274506.pdf
    • http://vafobotigef.pbworks.com/f/safamosuzed.pdf
    • https://uploads.strikinglycdn.com/files/cf3215ce-2a0b-4151-a4f1-bf6133227a60/juzuku.pdf
    • http://mifimoruzuwo.pbworks.com/f/38842004157.pdf
    • https://uploads.strikinglycdn.com/files/0fb6885d-e1fb-4cef-9bac-900cc5665134/who_manufactures_amana_ranges.pdf
    • http://gajufabeke.pbworks.com/f/how_to_pair_jvc_headphones_to_iphone.pdf
    • https://uploads.strikinglycdn.com/files/3709da95-db31-446f-a10a-5d3d73127b1d/colossatron_hack_apk.pdf
    • http://xuresasadox.pbworks.com/f/40684454957.pdf
    • http://mumasenekera.pbworks.com/f/jibuwememipomomibor.pdf
    • http://pivumiraw.pbworks.com/f/porilufirovovikoronofe.pdf
    • http://lonazetubuz.pbworks.com/w/file/fetch/144551454/titokusomefadarija.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_off0000eaec.bin
4b8d909e2ac7dadf63349b6e3cb0c843240527feb3144e07f5c00955e7df1d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 5044 bytes
font_01_sfnt_off0000fc37.bin
b1b1d1395b02dfdd15431f3df06ff2b7136a67283ea5ae8a1c2ccf53c62a8be9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10208 bytes

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