Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30394d2488f3ead…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 12:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2f20f246f738c7a86a3ca29f89cf1ad SHA-1: d23e6189b763d4448bf89083b2181206f29be0a6 SHA-256: f30394d2488f3eaddc65dddb49ba24ddd5aa646fcb3c090a35960caf71858a63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=convert+apk+to+pdf+online PDF link annotation
    • https://lemarko.com/userfiles/file/17752171688.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/24839535521.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/sevelogobosavevejuzozit.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/5823109473.pdfIn PDF document text
    • http://budka39.ru/files/takasonuwetirabovopovazeg.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sadivuvujelozosamuzi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae5b5240d---kudiromedugipafeni.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/94521260647.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/zapesozofowizedip.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/9609066377.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/98967644277.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/69666163502.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/figopukivora.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/rekemekeditov.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/88971373673.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/28852353066.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/95336259456.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ba345e07d---moven.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/tobaroxefe.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/vamuwid.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/vuraxulux.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gerisebeg.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/vipogikokelixebozebefinig.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_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 18092 bytes
SHA-256: 3f4776ebf8db122e09dfda8dc03f540dab3f01ad8f8bb553b44697a5c44991e9
font_01_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 10512 bytes
SHA-256: 8f25fb3545492ae08706b85da719c20fd545236b07edc81eb16120c1fe95ba7d
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1