Malicious PDF — malware analysis report

Static analysis result for SHA-256 68cc174b017f00a1…

MALICIOUS

PDF

79.2 KB Created: 2021-02-20 01:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d58cca7a7d7b9a7f3674cf3015b3197 SHA-1: 0caf0c88160bd1ededf159c7847bbd65c3bcae3d SHA-256: 68cc174b017f00a185b80a605d51cfc391a16e5ee5f9f0c2f8819f0ac4d9f803
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://jacksth.ru/123?utm_term=fundamentals+of+heat+and+mass+transfer+solution+manual+7th+pdf PDF link annotation
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/rizelesudi.pdfIn PDF document text
    • http://makamar.online/acknowledgement_of_service_divorce_form3fjei.pdfIn PDF document text
    • http://tk-pobeda.site/18462426739yf2da.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/mafesafubapiwa_kaserirudufudu_pejiwoxubuf.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/xeruwixavoxevowasik.pdfIn PDF document text
    • http://dontbeshy.xyz/poser_multiplication__virgulew5dj6.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/duxunewed_bejitupunem_pelenasevewif_jibazivizalot.pdfIn PDF document text
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/mubebe.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/fumuzelokela_bekizutemuna_posazibakivis_gasop.pdfIn PDF document text
    • http://fherixq.com/nixexiwugivawu60920.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/pejofotapuxaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojizevujodi.rf.gd/ingersoll_weather_report_hourly.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5316 bytes
SHA-256: 98b59acb4c498a4d60502de519701514ec8a725d3385387df2c5e57967effe49
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11824 bytes
SHA-256: 7833a7b537923a6330e207446d70fe3e200641492853357fad0c5546c126d072

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