Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67631e8e4b35643…

MALICIOUS

PDF

108.9 KB Created: 2021-03-02 12:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b53184e9f1d6c37f0ec3bc1012b1c9cc SHA-1: 21930c570563671abca39d196c6bd6dc31dae8b8 SHA-256: c67631e8e4b356433bd399479eecf0c6d62b9cf774e614c8e292ff26bd0fb32f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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/123?utm_term=what+were+the+terms+of+the+treaty+of+fort+laramie+why+did+it+fail PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374986/normal_600d396fedc6f.pdfIn PDF document text
    • http://whitecheat.xyz/tureguze7pp6l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5feed513ad5db.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/sawikelot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_600d99926cb1f.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/wejavonisefomove.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/57555637914.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/2856991.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/stephen_kings_it_2017_full_movie_watch_online.pdfIn PDF document text
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/lafojurufej.pdfIn PDF document text
    • http://modernstyle.pro/45459159414yt25h.pdfIn PDF document text
    • http://vereffka.xyz/dirodivirabamopewinakdhdg.pdfIn PDF document text
    • https://wewiloviwa.weebly.com/uploads/1/3/4/5/134585183/gofofas_vejesasub_xowebekadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_602b79cbc755b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_6009f4ed51c40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visunizuze.epizy.com/ejemplos_de_reacciones_de_combustion_en_la_vida_cotidiana.pdfIn PDF document text
    • http://jekutekovemimav.rf.gd/59966074757.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/dog_man_books_guided_reading_level.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/blackmagic_atem_mini_multiview.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16225 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off00016ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA7 5356 bytes
SHA-256: 1fbb14e67606ad2cea95ebdc98924e8bab429362bff4d8d77c29fd4c43fccf9d
font_02_sfnt_off00017ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECB 11216 bytes
SHA-256: eb0b9545e283ffb80b433bd4eadacd634c569f261e720637228314cdc7454f9e

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