Malicious PDF — malware analysis report

Static analysis result for SHA-256 655faa1f1c21bc16…

MALICIOUS

PDF

77.8 KB Created: 2021-04-21 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 191f605a74c115db94693b3955adf5c9 SHA-1: 7d54171b64099e24a5c449db98fdb618e46432bc SHA-256: 655faa1f1c21bc162e29982cc527e4d5770ef1fb5887473e481bbac748d52ace
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=times+table+grid+30x30 PDF link annotation
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/191265.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/babosuxovi_baxiwevi_kipoju_woripipesetogav.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/rGjcwzl/20407631267.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/viliv.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/ianAWjg/mixajixifubosot.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/7380178.pdfIn PDF document text
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/4983195.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/kuxifukitadamew_xererubuvibok_nemuzabenug.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/7jahcoy/safety_rope_cutting_knife.pdfIn PDF document text
    • https://dimenitajobe.weebly.com/uploads/1/3/4/4/134444553/4103330.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/paxenigorewa_nomevalejibaluw_nevikaz.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/love_languages_list.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/wolugutop-lilakibaziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurunetotej.rf.gd/mexoximabubiwakuginuzado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42111ae9-fbf5-4c51-b28f-4ca08e001948/16534125347.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/48993452813.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/big_bang_theory_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6cbb08-5656-4b8f-9d94-cddb0a0612bd/91337127987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b3bb38-f36a-474a-a6e4-2032805ff114/wuxetowigij.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/85244807631.pdfIn PDF document text
    • http://pamikasiwame.rf.gd/srimad_bhagavatam_with_meaning.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5608 bytes
SHA-256: ba1eef0e244adb5e3ae6d77f87f4981e6d90c18b94fb1465c3e84a3a8e5630cf
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 11640 bytes
SHA-256: 4dc6eeba044b742d8ffd861c572cd7d522a74d1efaa45b235db8bd4d5661be6d

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