Malicious PDF — malware analysis report

Static analysis result for SHA-256 3696ad52f91b6ec9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 06:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 749fabf2905a0be42f7c6dd08e4e580d SHA-1: b87c349bd66cdf4231f9d551d1ee7b23e0c68594 SHA-256: 3696ad52f91b6ec9fcf8e72bfaca0d3ec8efa6785ba98e366f76e210e5c927b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and numerous external URIs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sapthagireesyathra.com/userfiles/file/tosufozusuxogerem.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdb79204cc---pakisibasixatowudodadej.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/74241528881.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/60780941565.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pukup.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/82806452616.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/84386850293.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/86326803546.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/97658858581.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/vuzaz.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210918_788EB721079C9867.pdfIn PDF document text
    • http://ellev.fr/upload/files/bilipavelirin.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/71914759017.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/jigolox.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/7386456554.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/betetemuzimelu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/66118579746.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70597593868.pdfIn PDF document text
    • http://newshop.jp/archive/file/jufelixuxi.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/66129264028.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/52382854599.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b17f893cf6---33790482078.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/34643539403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+channels+are+the+boxing+on+tonightPDF 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_off0000b2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BF 17560 bytes
SHA-256: 1335dfec55073ac2e825ee8cca453d8756000057c7593c751ff6ba20af4df398
font_01_sfnt_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10744 bytes
SHA-256: 9ad47d5de91757ac8b3b6b3e38822c11c2085e9b9f9e6c48737bbb39e159ada1
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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