Malicious PDF — malware analysis report

Static analysis result for SHA-256 87742d7eae82ce89…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 04:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2301067bb5d0124a01f4b2f7e62ad6c SHA-1: a8a905dff65685fff10cc9967a88c2a346187172 SHA-256: 87742d7eae82ce89aec347a9f9bf9a1d0bc45d6c3c39396c5286dbdf3d1802b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document's use of multiple links on potentially untrustworthy domains, often employing UTM parameters to track user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=fifty+shades+freed+torrent PDF link annotation
    • https://maymac.info/userfiles/file/50102052620.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/87162195523.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/pojonajazoradazan.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73025716001.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/kuxejobu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/71998332044.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rekiredipowakulixumax.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/82262285701.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fasanib.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109061559077867.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bumiwabisufotasufusi.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/56671940369.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/lagulokan.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dojev.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/12454537963.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/44531961545.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wekusigovakapizepixete.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/81156997836.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/15898492494.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/93186163487.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161331a04e179c---44758727232.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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 18068 bytes
SHA-256: 62b92aabdfcb8cb43f8526c588f682642c2d9e8240ade2a959ac6eab9a3d5cfc
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 10496 bytes
SHA-256: 086b582034a54697923b11e8d8ebc353a0d8c2639823670f61c65617987a0a2e

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