Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0fd16abf0292a9…

MALICIOUS

PDF

58.6 KB Created: 2021-03-07 07:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cb808b11511d065ff95e6a2717494030 SHA-1: 588aeccd04c2dce6b5d285448c5e1b304dcb84b6 SHA-256: de0fd16abf0292a980a0d03f4e52c2016b99b28e6a2768c10abd6a685ad792e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a lure related to 'Hoover steam vac carpet cleaner instructions'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ML and ClamAV detections, strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure itself can embed malicious JavaScript, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://seumenha.ru/aws?utm_term=hoover+steam+vac+carpet+cleaner+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372963/normal_600b554fee6ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473902/normal_5ff15a68f2d82.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/vifodowatutugozarujonl37l.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/jamotegivilafidikobo.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/iYfKjhK/wartide_heroes_of_atlantis_wiki.pdfIn PDF document text
    • http://wekeb.space/soxupabimepafutovetipuwqliq.pdfIn PDF document text
    • https://cdn.sqhk.co/jujegopenop/djljigd/ryan_toysreview_roblox_mad_city.pdfIn PDF document text
    • http://uorott.com/time_to_beat_halo_reach3v7vi.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/Xaruiiw/foosball_game_board.pdfIn PDF document text
    • https://cdn.sqhk.co/gevolonovare/ghdgcig/77043078963.pdfIn PDF document text
    • http://andyhong.blog/what_does_book_of_enoch_say5y8u2.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/lototezivevav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed45ab-6962-494e-a9f5-b75ed5bb1e0d/how_to_reset_mp250_canon_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab220a8c-952c-4826-af7f-34ffbf895e74/54381059644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1696c9f-f8a2-4f36-8c15-5f27948c3f84/govijire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635aee79-e0b6-4c7b-a52c-7e7466f580fc/purogamedamabigibaned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ac6055-7c2c-4727-8ff3-829ada129f6e/sopitapaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bdf5f0-d4a8-49d5-9f21-8ecca9c8ca3a/what_time_did_the_blue_jackets_game_start_tonight.pdfIn PDF document text

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