Malicious PDF — malware analysis report

Static analysis result for SHA-256 131557e21fa0cd9b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-25 07:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 414a231c947da851800f426527e5e2e1 SHA-1: 1fd53f282a4eed2823094349b90e4e2d3b345771 SHA-256: 131557e21fa0cd9be49b69457802677e220323150108bec4f8ce2d948c767cfc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to technical documents, likely to attract users searching for specific information and redirect them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=alfa+laval+shell+and+tube+heat+exchanger+pdf PDF link annotation
    • http://lnstagram-verifedbadge.com/754742050539aa8m.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/the_four_scott_galloway_free.pdfIn PDF document text
    • http://meetsoda.pro/pioneer_ddj-sx2_dj_controller_amazondxt1n.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/zezekakurewo.pdfIn PDF document text
    • http://avtoshkola-region26.ru/netgear_prosafe_plus_gs108e_8-ports_switchzcg1s.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/48040631187.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/21622507755.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/bhairavi_mantra.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/tijisakulibolu.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/alrededor_de_tu_mesa_francisco_palazon.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/beowulf_poemat.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/53010232074.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/nixon_watches_near_me.pdfIn PDF document text
    • http://rewokujow.scienceontheweb.net/schneider_mcb_c60h_catalogue.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/zujeloku.pdfIn PDF document text
    • http://geesecam.com/fezalupolajoxd6k.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/18571160244.pdfIn PDF document text
    • http://ampinternational.org/xusigilefamikukujuzwc8v1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/6858888213.pdfIn PDF document text
    • http://pujumek.myartsonline.com/62300060765.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/dusk_till_dawn_meaning_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/reduction_of_azides_to_amines.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/88902389642.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_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 5672 bytes
SHA-256: d18bdd8dc5ed550319a859b3decd6c351b11a054a3e7836272f69dd799c8fede
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10892 bytes
SHA-256: cdefd0bc7def9ab2e1f054067a1201b2a01e7becb246145041974bde64b91a1a

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