Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ab8d0118da9cf0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 07:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cbdd537c9864e834cbe1efa08ffa09f SHA-1: 5460243f7a0f0ce5d15cf96d3aa0125e5ccd38de SHA-256: 80ab8d0118da9cf08d41957d0567a1138452a0bc314fffc133f7301ff9894ce3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is part of a scheme to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=how+to+move+photos+from+one+android+to+another
    • http://pharmorgsyn.com/upload/files/puxesezinaniremeraromaza.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/82753540015.pdf
    • http://wyadonline.com/userfiles/file/fibubadetugax.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dajaguxedatudim.pdf
    • http://currycornersugarland.com/admin/images/file/77492622513.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614013ed16903---8777157070.pdf
    • http://tzsunup.com/upload/76434040510.pdf
    • http://opersan.com/file/nesifurezovola.pdf
    • http://ngor2-3.com/file_media/file_image/file/kevirijagaj.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/68263278266.pdf
    • http://weforyou.it/userfiles/files/22223096938.pdf
    • https://bdata.vn/upload/files/19098329525.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa577d7fd---53093441144.pdf
    • http://studiobaldizzone.com/userfiles/files/surovozenisipugulu.pdf
    • https://aonetreks.com/uploads/file/mipuxabaxarab.pdf
    • http://thesecurityguardunion.ca/userfiles/files/komoduw.pdf
    • https://nexapos.com/upload/files/75371359170.pdf
    • http://www.donboscovizag.org/images/files/9715242961.pdf
    • http://4tyres.nl/public/files/41493562520.pdf
    • http://kondicionery-lobnya.ru/upload_picture/file/xivepulane.pdf
    • http://asja-doll.ru/userfiles/file/74281513557.pdf
    • http://www.77ice.com/upload/files/fanabavexojujewabuvepol.pdf
    • https://thomsonindia.com/userfiles/files/tasorirojelinenivedugiki.pdf
    • http://vivo-mebel.ru/upload/file/63557696129.pdf
    • https://puntodeplacer.com/userfiles/file/fiwalawerusutala.pdf
    • 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_off0000b079.bin
85ffbbcddb277f37e2d5c08d715b05e798f1f62d4f924b5152b0f75281643e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 15628 bytes
font_01_sfnt_off0000d7e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
font_02_sfnt_off0000eff7.bin
c1f7f777ec6ed50428be91b43f9ebf42eafa83e2039128153a0285fdd0b35906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 10860 bytes

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