Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1b5251cd851bfa…

MALICIOUS

PDF

74.8 KB Created: 2021-09-27 11:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26181b7c9f27a099ccfc45a322f86210 SHA-1: b443ca39dbe298c80da58324fb715312dda2a15f SHA-256: 8a1b5251cd851bfa2398a5313089948acfa799c8cc215f0638c07d79bfe282e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'link farm' heuristic indicate the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=control+another+android+device+remotely PDF link annotation
    • http://wflyyxzrgs.com/uploadfile/file/9756d774c3f2fd11230d019fb66c9fa3.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/3620701800.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/6251922051.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913031242174.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lelixudulonimijokuna.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/ribeg.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/96720859460.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79300245817.pdfIn PDF document text
    • https://loyd.rs/images/file/zugokofatedumopazurija.pdfIn PDF document text
    • http://holzweiss.at/3565614412.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/85916347851.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/rugadalulefipig.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/95276116011.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/risujole.pdfIn PDF document text
    • https://ambalatender.com/upload/files/jixagevigodijakali.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/palironosifata.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/6134527176.pdfIn PDF document text
    • http://atrsara.ir/resource/files/lafijasujiwiludojumezew.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/67916760917.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/47668473431.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/gewapilakixedikota.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/26129893564.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/padaxuvapudonemu.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/wojunawa.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/tixifotarejiwi.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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 18316 bytes
SHA-256: 90c8dc81f9e6a8761a2e224dfc4ff9106a874d694a12db97ddb6dcfcc2f192f6
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10676 bytes
SHA-256: bf3e48ccb2218deafcff3d71d4f2e5e4910345e4516805f437dcf12d33206828
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1