Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a399bab13aaa2…

MALICIOUS

PDF

87.8 KB Created: 2021-05-17 19:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 32b2b6cb5f24e3961a8728964b628c40 SHA-1: 7b7cbde7c8b9c572f911b6f6531a5b162b8dc1c4 SHA-256: 999a399bab13aaa2a71b662007a65755276896cc4c273fc1b4b109414cbcee21
126 Risk Score

Malware Insights

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

This PDF document contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and embedded URLs point towards an attempt to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=call+of+cthulhu+rulebook+pdf PDF link annotation
    • http://solifixogalek.mypressonline.com/gukuxadubimedekidof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417535/normal_5fe05abd642dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5fe6d26983c0a.pdfIn PDF document text
    • http://zogaranana.22web.org/where_can_i_refill_my_sodastream_co2.pdfIn PDF document text
    • http://jigatinapa.22web.org/56045245730.pdfIn PDF document text
    • http://vokegitejupud.iblogger.org/86323961433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_5fcfaf30555ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5fecc762e77b5.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/newikuruxol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_600e6cdde6749.pdfIn PDF document text
    • http://mazipuvaxa.mywebcommunity.org/pujifimimerugaborimoboj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefimubis.myartsonline.com/fujoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9398faa8-ac48-4910-a00f-c9bdfe784fdc/56816700993.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_89e0651352c64a129c68bc80900670b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c058f793-7b87-4f64-9689-d2be311f87ad/87512974215.pdfIn PDF document text
    • http://xiburebejevikom.rf.gd/centos_commands_with_examples.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_ada7f690c9a34350854c08afb9d82fb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0160979d-0651-46c9-8fac-0364e752c5c4/the_taming_of_ofthe_shrew_act_1_scene_1_study_guide_answers.pdfIn PDF document text
    • http://validexa.epizy.com/how_to_find_penny_stock.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_f307b03f8fe04679bf21ae609b6d75b6.pdf?index=trueIn PDF document text
    • http://tuzegonu.rf.gd/bozilexexut.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_4d1b17c4634e42d0b8541dd578aa4aa4.pdf?index=trueIn 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_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 5172 bytes
SHA-256: d4246b98dc847084334166e3947b54c12939f09c14b931500b8f47d4334e34b6
font_01_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 11112 bytes
SHA-256: a90a514b11f08cf2b859ccc3026519c72f00eac3a8537003ef1b75563dfee0ec

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