Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ef1405679034b4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 16:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bef9b0b7e487004d9860dc52c8a55740 SHA-1: 81a723f29d996136f868377eb188539d78a114b8 SHA-256: 98ef1405679034b4823c569d22bcd6de6ebf9e912f1e7491d1c6bb8a6e0f8481
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs that point to disposable hosting and appear to form a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for SEO manipulation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=flicker+free+movies+online
    • http://mtegl.wsystem.sk/userfiles/files/18060735736.pdf
    • https://ijtm.in/userfiles/file/28743621380.pdf
    • http://arci-mp.fr/admin/File/44227811040.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wenatunezexob.pdf
    • http://miskolciharsona.hu/pictures/file/84740154347.pdf
    • http://geologocarmignani.com/userfiles/files/4976413819.pdf
    • http://www.cafeinca.com/img/public/contenido/file/2726361229.pdf
    • http://dwornawodzie.pl/userfiles/file/pidupotatofar.pdf
    • http://www.hon-ro.hu/userfiles/files/23571396311.pdf
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/59113981239.pdf
    • https://pactforfamilies.org/ckfinder/userfiles/files/megemadedonudor.pdf
    • https://nomortiga.com/contents/files/61718500062.pdf
    • http://www.angels-rest.es/ckfinder/userfiles/files/nigut.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/pipujejedubepoxegi.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/javaretofugidamuguku.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/14934757732.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/koradojalovipafozetu.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/52934634457.pdf
    • http://japhina.com/upload/file/fatofozaxir.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b3ebecbe889dfd74828329943cb406d4/wifililikazuleriju.pdf
    • http://mayinmaunhat.com/upload/files/bevavosireximorufetif.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa469a352b---jipafewuwarotegujat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b108.bin
4bf51483779c0e700cdb624ac8577d1ad838ffac88ec4c575da369365cd2e69e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 16684 bytes
font_01_sfnt_off0000db83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
font_02_sfnt_off0000f39a.bin
12660ffaceadc44d84e6b610764930d87a7e7b3fbdbfbdda8a124d1ee04b4c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10372 bytes

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