Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc7be6ff67c5ca3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-03 09:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8a3ed86390395db89f1eb4bec13c211f SHA-1: c790819192335281b27aed478ca923e739b0f817 SHA-256: 2bc7be6ff67c5ca37cacdbb7ae1a2da78d88c667aaec64f8082fbca432b23977
126 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 document contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru', suggesting it's designed to redirect users to a potentially harmful site. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=what+is+the+best+brand+of+washer+and+dryer+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fcb11f9eb180.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_6004350b2f0f0.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/RjjiiY6/kugedevebenoben.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5febcf3c84210.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/hiRjcPD/dark_quest_2_review_metacritic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_60277b4f4a042.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/748104.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/possessive_nouns_quiz_grade_6.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/tuvukuxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6034cf9a02ca5.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/hgjfifI/29480546.pdfIn PDF document text
    • http://xulenegutuwovi.iblogger.org/how_to_trade_bitcoin_on_webull.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/worofugeko-kebarir-bibozusoni.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/VaKY7gg/14930812237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigazimo.epizy.com/zugubodesam.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/selenium_java_tutorial_youtube.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_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 5584 bytes
SHA-256: 74384254c2e2510950c4824290ab7423885479d8bd4c5c545cc13646e065b773
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 10460 bytes
SHA-256: 2825e69641a8fd2e7102f1df3a887a0fb657da82b70f383552033adb0b316e2f

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