Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3478f53752e102…

MALICIOUS

PDF

67.7 KB Created: 2021-03-11 09:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 68121e16f94ac5d2dc2c91596b382015 SHA-1: c188fb8991639def0f4dc42bbaa6f5c27061d43b SHA-256: 2a3478f53752e1024d61905b2771e21832a048333036f855c29d643a6ca41b5c
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the PDF's primary function is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/123?utm_term=takeuchi+tb260+spec+sheet PDF link annotation
    • http://nupewijanetari.medianewsonline.com/playstation_gold_wireless_headset_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/iakCiji/corporate_strategy_vs_business_strategy_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gJnNZA2/pop_shooter_blast_mod.pdfIn PDF document text
    • http://smartcoin.design/newotarosenalozotefoden5vur.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/39431353756.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/vulazapuketufagajikilo.pdfIn PDF document text
    • http://chambreop.xyz/tying_knots_for_braided_fishing_lineihwl6.pdfIn PDF document text
    • http://potenciy.xyz/what_does_607_mean_in_astrologyrtoy6.pdfIn PDF document text
    • http://ukrdomonis.xyz/mivezetusonapuvazep1kun.pdfIn PDF document text
    • https://cdn.sqhk.co/nubavojek/ib1qgjX/36005220513.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/9Y4kjd9/world_women_s_hockey_championship_2020_tickets.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/98607659525.pdfIn PDF document text
    • http://kewotij.mypressonline.com/tracfone_lg_reflect.pdfIn PDF document text
    • https://lifedeji.weebly.com/uploads/1/3/0/7/130739993/betipini-vivegomuro.pdfIn PDF document text
    • http://linufiwanekume.scienceontheweb.net/buranevozazoxeletu.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/how_does_absorbance_change_with_concentration.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/zlatas_diary_quotes.pdfIn PDF document text
    • http://sebekeruxa.iblogger.org/65094193251.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/9Ck8uja/jazirimoke.pdfIn PDF document text
    • https://finijigif.weebly.com/uploads/1/3/2/6/132681422/a9bde6b4197.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/clases_de_comunicacion_linguistica_oral_y_escrita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/vibekizajok.pdfIn PDF document text
    • http://bokakemipik.epizy.com/septicemia_treatment_guidelines.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_off0000cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC05 5476 bytes
SHA-256: a81bed53d10c93df21cd2fe47a5d22fa941559b38c43ea877b895f5252818349
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10244 bytes
SHA-256: 81900b9cd820639dd19b83319562dd663f5e300bd982c1d77da1c8166f37dcac

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