Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6f633639af4e4b…

MALICIOUS

PDF

68.0 KB Created: 2021-01-30 14:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ca2d3d169ffc7a9d677a0e56f617e5f SHA-1: 2f71fbe943e6b17078e18d6575f7fd8303dfa3ed SHA-256: 9a6f633639af4e4be25234b9878d831194c5bc90afe20a1f77f3569548412c11
244 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, and contains numerous embedded links. Many of these links point to known malicious redirectors or are part of a link farm hosted on disposable domains, suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated and appears to be junk data, but the presence of embedded URLs and the heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=automotive+labor+guide In PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/4956888.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/tepuka_vidoxeragepo_xufadelal.pdfIn PDF document text
    • https://tezimapegimera.weebly.com/uploads/1/3/0/9/130968984/6643919.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/kixebimi-fapewurijikot-mexiregotux-doxugawebox.pdfIn PDF document text
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/c1a612.pdfIn PDF document text
    • http://medway24.com/magewiwufamevu5wyk6.pdfIn PDF document text
    • https://bekitatabegoze.weebly.com/uploads/1/3/0/7/130775701/kirumegebet_wopurusigiwugud_negobodozuwada_xaduxilikasavuw.pdfIn PDF document text
    • https://takojetomegupaj.weebly.com/uploads/1/3/1/3/131382497/xinawo_wunuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogomazarem.epizy.com/business_english_worksheets_printable.pdfIn PDF document text
    • http://nanoxamovafosox.epizy.com/deep_purple_highway_star_organ_solo_sheet.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/army_punjabi_song_video.pdfIn PDF document text
    • http://dilezupuforew.epizy.com/apa_citation_format_example_bibliography.pdfIn PDF document text
    • http://texatopewewew.epizy.com/war_hypnotic_brass_ensemble_sheet_music.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/chidinma_kedike_music.pdfIn PDF document text
    • http://dixegozep.rf.gd/vavujewuditi.pdfIn PDF document text
    • http://numivonef.rf.gd/wudufimaxexabomogufezuv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 5156 bytes
SHA-256: 498c31a48ed7fb35bbb1d18f5b781712ee2931202b39053ec34231e1d58def3d
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 10128 bytes
SHA-256: 7a53b1bba9a5137402c8b9fff90fccb91dae2daa8a0fd35ccbd34aaa2cc14226

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