Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a64b9c98baa7f9a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 07:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78b91e5de33e45a2d11fad5b9fbd0f3e SHA-1: 39f2533024d9c0d7311ddf3b6e6314d8e886a0d2 SHA-256: 5a64b9c98baa7f9a52063633c53ad4266d2480a94c4ca630ebe99cea095f7154
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, designed to redirect users to numerous other sites. The presence of multiple external URIs and embedded URLs supports this finding, suggesting the primary goal is to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=logiciel+recuperation+contact+android PDF link annotation
    • http://keyday.ru/files/files/raxaretexepaxidotari.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68957325829.pdfIn PDF document text
    • http://tempatpasang.com/contents/files/badigoxoxotidewufosesefe.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/belebowupo.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/xakovusesunobiraf.pdfIn PDF document text
    • http://sung1.com/upload/files/85316352261.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/xokefipul.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/rosokufap.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/bavikavate.pdfIn PDF document text
    • http://finchamauto.com/pics/88106612762.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/dadopimaboz.pdfIn PDF document text
    • http://thaide.org/userfiles/file/38357265608.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/zobuw.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/pukudiwuratu.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/kekas.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/bekobufopikoxotobi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6113f0bc4---potinebubab.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wekuvaxogoximelebiw.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/piwalogabusir.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/34852231381.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/koxuxesepaluxuwawepi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/64864857731.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904141906907.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 18308 bytes
SHA-256: 2bf1529adf75b3c7f4ebec4049d77671dbe16f9df69ad970bf3a8c86fff14970
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10580 bytes
SHA-256: dfdd56c0914880d4cc97f4d37b0c28a125429f56c7a9364e34faa56756e16df6

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