Malicious PDF — malware analysis report

Static analysis result for SHA-256 43070637f91ef436…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 22:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a03566f510d947cc663a2922583c8318 SHA-1: d6a50a3e80a709e130c80ef18a09b94a19d81d00 SHA-256: 43070637f91ef436c6b26f1b45b94a346eb64f9ce068f16ee05fc92d57e7489d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=anatomy+and+physiology+chapter+1+test+answers PDF link annotation
    • http://pewujok.mypressonline.com/33644157066.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/mihiybk/game_of_sultans_facebook_hesap_degistirme.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/jimilasipesogoxesolen.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/hciaNQT/73546536188.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/blues_scale_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/gUijjdx/evertale_training_dojo_6.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/Vii8ieg/fozeluvoxigoki.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/zusunuxigire.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/yEjQOif/5_speed_motorcycle_for_sale.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/mekibe.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/poxifujotumefan.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/74617721431.pdfIn PDF document text
    • http://lutirojibafap.sportsontheweb.net/ttd_2020_calendar_download.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/benubapopikaj/96217051184.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/2504392817.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/sikuvorekixuzajomuviwegu.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/solving_equations_word_problems_worksheet.pdfIn PDF document text
    • http://katosijuxemewex.rf.gd/15195237627.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/59260231942.pdfIn PDF document text
    • http://renezaw.rf.gd/41267742681.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/the_fallen_leaf_thai_drama_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/73784357264.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/78989411726.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/pulp_fiction_bible_quote_samuel_l_jackson.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_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 5720 bytes
SHA-256: ca40e3f34ccb04b6c70df640f66c9ac01323788342147d5fa4b5324999075d30
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11496 bytes
SHA-256: c1e81efbefa8414b5c20dd062b09b0547de6bdc7998c3deb39c1bf0a0339a1c4

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