Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29c4ea098b3d185…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 16:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cf3ac6a9d64c2bcf7acab285bf66412 SHA-1: 098a1702a515e7f0d9948b8a8c4c9d27e3c80bbd SHA-256: b29c4ea098b3d1853527ea7ff9d9484dfa1c5bfa59422fe27b7da0b50555c85a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points towards initial access via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=pokemon+soul+silver+cheat+codes PDF link annotation
    • http://olynskiconstruction.com/pics/file/88549427771.pdfIn PDF document text
    • http://innotack.com/userfiles/files/30302452010.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rasilunadip.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/90763356596.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81ea64bbf---ledekew.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/vipusibotexugizegogawis.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/26980997457.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/sabogakonajuvejodebu.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/33085257884.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/91098053454.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jiminemurubekuguvex.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/juzokejosif.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/87086405154.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60467270412.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/73574020259.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/54982494075.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/49475058722.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/denosaxon.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/7711747842.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/tamofakopujusonobote.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/sazibixuzalefadago.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dunajagelalorewuteg.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/gojapuf.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///tugexor.pdfIn PDF document text
    • http://dkind.net/userData/board/file/gixewawu.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jomisumis.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 10892 bytes
SHA-256: 7932f828ebf3a9eba0168768a33933ac6fef7f7a6c5cab51ecadd4d12c09e408
font_02_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 17748 bytes
SHA-256: c302646c66df44e48ef51d7bcc117a39fd4440a3acc6c821a4b2942c6deebc2e