Malicious PDF — malware analysis report

Static analysis result for SHA-256 787581c1f70ad0a0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 05:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24b415acb802fe2570b478e3dd90b733 SHA-1: eb45c4f06964d30b2c814781126e763ab82f4b0c SHA-256: 787581c1f70ad0a0b45db1dec3cfdb9debbedf68671a38d4c1f68dcd5ffeaf09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=drive+sushant+singh+rajput+full+movie+watch+online PDF link annotation
    • http://gniortho.com/files/Upload/file/dumibuzotafuduvukejo.pdfIn PDF document text
    • http://chapelguild.com/images/usr/rolurisit.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/tofetakarowi.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-18/images/files/93090528284.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kupero.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab958412d---ragumabemarasifisufa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/5501304438.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/fisoxodononamagikot.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/nesofonisegiziwakixefu.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/ruzekeki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73982f242---41999353189.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/13261312171.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/8349961367.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/77130838019.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/jiruxi.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/43496297551.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109041737037668.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/57042551833.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/72100942693.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xulizavigos.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/ximevitazawibomotisinusa.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/53314015910.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/100454564324.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/zusalatimofafazuvidunudik.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rozoboruduxobano.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 11312 bytes
SHA-256: 62efc589c0d8b556ba6c381cd6c0d402a37ecb1a2e2668d31c563c37e0420557
font_02_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 18552 bytes
SHA-256: 8a3d807436b51023cea6f9e435055571303fc4e49c47cb3a834b7c8010bd7a5f

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