Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad22084e6a0c3b78…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 05:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cd92bc641248ed3702c71ef2b25ab65 SHA-1: 21291a5a4f5faaf41e60798586df61aa293af2c2 SHA-256: ad22084e6a0c3b78c2a6de2c738f1d5bf2c9fd3d999dad4e12d0d1fc9a498746
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the sample being part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The embedded URLs, while numerous, are predominantly unknown or benign, but the overall structure and detection strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://korzayithalat.com/spot/admin/fckeditor/userfiles/file/94818806110.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rch47qvdrk28hn3btguql7b2s2/37221966743.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/genugafedenekojagu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/76448632055.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/95403070186.pdfIn PDF document text
    • https://amgaa.org/temp/files/5316517174.pdfIn PDF document text
    • http://hingliltd.com/userfiles/sepobikideju.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/rozajarokeziperep.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/33202557795.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/neraxikokafajizo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/02a5bc5ad7292181252658e1e6ebc97a/bebafarise.pdfIn PDF document text
    • http://htwy.com/upload/file/bajusadowonav.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/95040003600.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/molujudu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bedesilenalorixetu.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/gegetiwolovadupebugag.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/98271614128.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/5932781535.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/12691815468.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/kuperuposov.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/36001660462.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210906042744.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/kaliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=marsden+and+tromba+vector+calculusPDF 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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 10736 bytes
SHA-256: fa349d1dfabf437dccf2da78994358babd64b85aab8f5c864fe93dc286a23195
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 15984 bytes
SHA-256: 0f5ff12088e1c1327daf2b3f84552c26e21e24a702254eadd80a35c98643d835