Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4d4c3e5e8fe1b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 21:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0133d39c2c8c2a0143b19ee543d0fe68 SHA-1: 7d4a499939a50d10ea5bd271926839458548aa8f SHA-256: 9bd4d4c3e5e8fe1b9d85f2a94184560db8b4ddf3b8486a3664fb07e47e295404
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to external sites, and a heuristic identified it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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.
  • 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://booklandbooks.com/userfiles/file/92776518601.pdf
    • https://trompis-tondschungel.de/userfiles/file/35495593581.pdf
    • http://vinhthuanvietnam.com/upload/files/51238480345.pdf
    • https://vrindaindia.com/php/joseph/uploads/file/42790756470.pdf
    • http://3wsystems.com/shipinc/userfiles/files/38212594404.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/xuxonar.pdf
    • http://tonghuichem.com/upload/files/67929671439.pdf
    • https://anitt.in/ckfinder/userfiles/files/makagitabegiduniro.pdf
    • http://jinshi66.com/uploadfiles/files/43838064076.pdf
    • https://hobbypet.cz/files/file/18278635461.pdf
    • http://tizianaiberti.it/userfiles/files/28039608201.pdf
    • https://kenadong.com/contents/files/52859644897.pdf
    • http://yilbasipromosyonu.com/userfiles/file/tapisujunanizixidesirap.pdf
    • https://eltonltd.ru/sites/default/files/uploads/dexowazut.pdf
    • http://energo-market.ru/sadm_files/19325162837.pdf
    • http://marchmontnews.com/imgs/file/46327628097.pdf
    • https://obrbikes.com/files/files/95146328171.pdf
    • http://taemyung.com/data/upload/file/94128625430.pdf
    • http://eshop-kocicinadeje.cz/files/file/34240277937.pdf
    • https://ceylanotel.com/firma/files/51128248019.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/tegebonizob.pdf
    • http://wangguanhardware.com/userfiles/file/fafinejikixuwikid.pdf
    • http://yossy.biz/userfiles/file/72613440785.pdf
    • http://camel-republic.com/media/userfiles/files/fizedixinidisi.pdf
    • http://flomojapan.com/upload/files/fovixiwewodujadelika.pdf
    • https://norservis.com/files/files/xomerupos.pdf
    • http://bloemenwinkelindex.nl/images/uploads/24349936454.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+transfer+storage+to+memory+card
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fc.bin
dfc72fa2a18bad0d9bcb09074c4a5d88bc61159e84664fa95e7e187f5ca32a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FC 15500 bytes
font_01_sfnt_off0000dcff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 16792 bytes
font_02_sfnt_off0000f516.bin
855c4301b60c75406ca54e9edceee2f52232af7b3261ec987688484aa90e9a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 10872 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.