Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f2ccf81c8e3422…

MALICIOUS

PDF

90.4 KB Created: 2021-09-09 16:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: beffb5333ba6ed143e56cb748fa0cc2d SHA-1: 92eaf6fa30f2c8eb0664ac9b3909333d56da95b1 SHA-256: b4f2ccf81c8e3422412fe5b7efcdef0df92111c9769780d489e20ed1e3e3b13a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous external links, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://reutlinger.pl/userfiles/file/78011233081.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/49049361135.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/towixogelesizofoji.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/vofurononizelo.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/82986490910.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zodasikebomosixu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/7952056904.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/13386818546.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/55143640793.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bfbcd91---lozuzopesufobebede.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vurujim.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/55306293370.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef8184c4b---woxatulopidokarovufosowe.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/tijibefajomozu.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/31231674248.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/zafexavib.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/74033316016.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/92087586020.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/67408605544.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pijokigijubomakiga.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/laregibuw.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/64106415720.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/bexoxazikaraso.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vofasutawuvi.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=teatv+apk+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 16264 bytes
SHA-256: 218f1e83e8a1ff08902d70ece391aa5b208064d222c975bde569b3df29ee0b19
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 9976 bytes
SHA-256: 265873b6502e81e8b2c437b16b96348206199f40cde0c35e7c2e55c810872f09
font_03_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 23608 bytes
SHA-256: 77270ebc8b11f6ae5872657433c89bebc4474497960dd3c440397d733dd04bdb

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