Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf52e620f69d0a6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 11:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f5c6b98b22c131bb8e84ffa11aa972a SHA-1: 925c1c954a73b19abd2e2ef33135bacda87711ab SHA-256: ccf52e620f69d0a6d8e77185f7e42fc140651b292449b3adb1863984a4573622
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/31539167714.pdf In PDF document text
    • http://www.specemc.ru/upload/files/gabalonip.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/43656094198.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090205124898740.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/wifibenerakokedupa.pdfIn PDF document text
    • http://praguetransfer.com/files/file/bobozafilinukuligesoz.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/32757223314.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/58685481582.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/50049361554.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/18934995163.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/60911196915.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/givifufa.pdfIn PDF document text
    • https://papiratisk.cz/soubory/69361822102.pdfIn PDF document text
    • http://taociren.com/upload/file/210908232050181377fsfpa9julghs.pdfIn PDF document text
    • http://biosite.ru/images/news/file/69377105676.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5de9be22---wewowonebaxegekunilopazon.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/xevosigo.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091908041560.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/50715524803.pdfIn PDF document text
    • https://architektor.ru/uploads/file/70912742104.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/gebijurupisifotos.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/55317786232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=braun+and+clarke+thematic+analysis+2006PDF 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_off0000b171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16256 bytes
SHA-256: a2b605845e2bb8c7e9015cb3c86dc0d5baf3bd3eda5b4ba7ecfb8f018de46902
font_02_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 11284 bytes
SHA-256: 5633cd980cb306c24271e220142f23e2b5c79b7aa9df8d5278e6a1a495ca1fc7

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