Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e891a29555995fc…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 07:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03620c3b759114c0c963f85a26f83521 SHA-1: 99e950216b933debaf0b7fe1a5b6e1c2ac3cd1ea SHA-256: 9e891a29555995fc8bb748321924040a161d940a9d52fb56f5366d70009915cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/uplcv?utm_term=pptp+vpn+android PDF link annotation
    • https://mallncart.com/userfiles/files/71861663432.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/pupuwibaleteserulodo.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/koxibonikekaroximisibaji.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/lefow.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/muvogopinitevezuzoxivug.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/rareworasebufulilofikuwas.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/15117332511.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/vabupopa.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/gibapamunavamimabob.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/bovobaj.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/95990796130.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090823233670554.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/95451546293.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/6630116755.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/47698684916.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/21164590162.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/zojove.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67c8a30775e26347168f666fcfffdf9b/39364179034.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_off0000be90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE90 10108 bytes
SHA-256: 98d13545d59b777186ccd939e034d9e8ca28c94165cce3f209192d37031b4ce0
font_01_sfnt_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 17856 bytes
SHA-256: 6486b094bad7c4284533f6d6337358686d754d5754a0f56893e053ab05b0c128
font_02_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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