Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a0dee63c196a4b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 23:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0a268aee2512521c37c9fce177ec9a9 SHA-1: 21439c596d44568770e7b05e1d44c716c2c0b90a SHA-256: a3a0dee63c196a4b4a2f70e36df2c4eb44d4d7ac1bee03916a4c833e207d0b89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it is designed to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://veterina-hrib.cz/user-uploads/files/15640085827.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/sovaxuriterozimut.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/479803264.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/zesamatatilufusovira.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/50617378230.pdfIn PDF document text
    • https://htchninc.com/d/files/dewedikolopeleju.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/5718544477.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/84938674924.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/wusif.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/31562590423.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3866894791.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/96260024714.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/kurotedusatid.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fa1439f027c37ac32ed9ee9e79030810/1418257525.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/xixanozimozexukumadifu.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bejiwope.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210923010109.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jusitaxatokefepuviluziwab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121ece593---33976666575.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/ganor.pdfIn PDF document text
    • http://vce34.ru/attachments/file/49868559433.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/zokixuzej.pdfIn PDF document text
    • https://emmaushuis.org/pages/gerilefewajavenilube.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9792038869.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/tovaz.pdfIn PDF document text
    • https://expomediainc.com/upload/file/15438259273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=words+starting+with+keePDF link annotation
    • 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 10652 bytes
SHA-256: 67e833b7b8b1b9d1bcd55321c34ea18861be365ba73613e140e067b984475291
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 17336 bytes
SHA-256: 50e270aeb357d84bd38e32104b0933f4ad10463ffdd30f3a25407dad190f1e2a