Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec4c439f614e774…

MALICIOUS

PDF

76.9 KB Created: 2021-04-15 02:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82b40bb78b6862dd47c1eb7454da362 SHA-1: 7f9ff5c8c3f453c4dd4661264862d07d5aced36b SHA-256: 2ec4c439f614e7744ef2a905997de78ee7eb30e400fdb15a68c48741ef664707
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 SEO spam operation. One prominent URL, https://ponafet.ru/strik?utm_term=statistics+for+management+and+economics+keller+pdf, is directly referenced, and the document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was programmatically generated. The presence of numerous external links points towards an attempt to redirect users to potentially harmful websites.

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
  • 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://ponafet.ru/strik?utm_term=statistics+for+management+and+economics+keller+pdf
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/jedowopizagedudexi.pdf
    • https://vixawesomuwevu.weebly.com/uploads/1/3/5/3/135387162/piburukoxulan_tofebufawupati.pdf
    • http://ronifibofizet.medianewsonline.com/xuvoxubulesinavuza.pdf
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/7d884602ca1c.pdf
    • http://fupemagis.mywebcommunity.org/class_10_biology_chapter_3_notes.pdf
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/nenuz.pdf
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/wakiwirotirunepali.pdf
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/roviguwefajop.pdf
    • http://zopesozali.mypressonline.com/dial_caliper_worksheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_66caf15deca54ca794e8738579c64296.pdf?index=true
    • https://s3.amazonaws.com/zumomasugipeno/bimorilefowe.pdf
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_75a07fb83ecd4259aef1616d8c61759f.pdf?index=true
    • http://wosolebaxuwutux.rf.gd/sufomogasivokabapafo.pdf
    • https://s3.amazonaws.com/jojitagifuva/how_to_turn_on_folio_keyboard.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_6b8b20f4c7b945079af972e253510440.pdf?index=true
    • http://wubezirinipo.epizy.com/alteryx_certification_cheat_sheet.pdf
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_89f9bbe3e6cf44ec8d8d1ee787572b53.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_off0000ecf9.bin
603400610917e1c4b482920f18433456a77717b362b1c08fb9e15357c597a247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 5640 bytes
font_01_sfnt_off00010018.bin
b9d8107e568f926b079942e0c4c6478405d675842474a22298da0a463a81bc12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 11012 bytes

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