Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eb07ee86919fed…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 10:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77919b5c8eb30bb2017ac3a5e1d75879 SHA-1: 60384c84e6826459d07fd1155f1a945f0b89bc14 SHA-256: 98eb07ee86919fedeb639e47f72dfcf380fd39c346f610901dfaedb44ffddbcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=tom+and+jerry+willy+wonka+full+movie PDF link annotation
    • https://parlagame.net/calisma2/files/uploads/43470204039.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/23173065940.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/nipadubonagireret.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/66717105887.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zajud.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/dogiwo.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/52394585494.pdfIn PDF document text
    • http://grafitym.kz/files/file/85988432573.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/81449346704.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/48460977906.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/nijabaxo.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nifisapapelerezezisane.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/62216404959.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/52034223746.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/63258449898.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/89343764564.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/37339489533.pdfIn PDF document text
    • https://jck.ro/userfiles/file/duvaf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b48fd3dd8---rakoto.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/butadewaxinajum.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/9719958732.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/40694628896.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc02ec643---nedopupuzuvufop.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 19700 bytes
SHA-256: 1ef3be0a5c0ad1d151a504ba1571f65d07632cedbf0a9ddfe48d30c3d9f572ce
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10800 bytes
SHA-256: 538f50e2dfa261df71fc012e4f4c51af2ea0190fdf87ff94317293b201c7ea9f
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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