Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80a11d8ecb83efa…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 01:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78a5c7272a8120b95960240857c29fc7 SHA-1: 7c28526e92fb2b99bdc633f1fb1962b56812aadf SHA-256: f80a11d8ecb83efad565fc1b7dd8b64644a6d185ba0d224b3c0610c1c5c871eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards a malicious document, likely delivered via spearphishing.

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://allytemp.ru/uplcv?utm_term=peter+bregman+18+minutes+pdf
    • https://cardolf.ro/files/8395893503.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/nojipuriz.pdf
    • http://mobiliteit.nu/files/65356361130.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/82222773653.pdf
    • https://cortopolis.ar/userfiles/file/99707612312.pdf
    • http://luisacortesearchitetto.it/userfiles/files/12491912952.pdf
    • https://wegofa.com/userfiles/file/16430751027.pdf
    • http://haiannweb.com/uploads/files/51682757128.pdf
    • http://pietrek.com/MARCUS/files/file/66956072882.pdf
    • https://cpsguffanti.com/uploads/file/6200230095.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdf
    • http://sapaelitehotel.com/webroot/img/files/wuxavawavisizumivuzupas.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129a5cccf4---66491423910.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/vaxur.pdf
    • http://baobianhkhang.com/upload/files/xanajoz.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e85098a903fe64adead6b8c3b5323a0e/47930334101.pdf
    • http://www.kingsmen-cmti.com/upload/files/wuvidezazudira.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/34742584910.pdf
    • http://gtlfuelmarine.com/userfiles/file/futotoxubogagi.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210910230438_1317672654.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/79312926630.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/94190864162.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/zinuramuxiganekurox.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_off0000d51c.bin
2d49662abc1f6d232e39c4cca2cf74932af8b2f8ac2fbd91997a7d870297818c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 18156 bytes
font_01_sfnt_off00010466.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 16792 bytes
font_02_sfnt_off00011c7d.bin
5c577a8ea42fa3ae5f8b8ebab4b10a85bd836ff2747af37618cf537940d1c90e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 11176 bytes