Malicious PDF — malware analysis report

Static analysis result for SHA-256 4757c608884f9c53…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 16:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9aa22d19053d0cd251529228a95551a0 SHA-1: 7c2d06d45ad3a9eacbafb310620a52a2b447d9b7 SHA-256: 4757c608884f9c53fc70c0dd1de87dccdd7328bb233af325c7646a01f3402cf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic noting it as a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=latest+malayalam+movies+2021+online PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2bc13af22b677fcbb706c008578a0581/forisevorutelababevozofe.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/tugametadutip.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/17178148789.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/14057709613.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/71272140546.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/dubaveno.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/28030047746.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30260618340.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76107606858.pdfIn PDF document text
    • http://alptw.com/images/files/41048351941.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/fupoxuz.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/naketemomozem.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e01e3c91---67635707880.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/86876481997.pdfIn PDF document text
    • http://ccshecea.org/upload/files/36541618493.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/20304510478.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/gokirixeli.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/46171951181.pdfIn PDF document text
    • http://metall-press.ru/files/wuxezirifilugaron.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/paxupusezivap.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/lozumezesinolima.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_off0000b631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 18648 bytes
SHA-256: 36afff343f4b2240ee295781f161414baa790bc54b39297611b69871819f4d52
font_02_sfnt_off0000fddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDB 10600 bytes
SHA-256: 05dc49a7535c2fe195262736fff2a759e610633aaa204024cf74cd6a8ffc4623

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