Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a5bd83630bef47…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 04:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b2308b8f8135247d63f3e76fd1b44ed SHA-1: 04d7dc05360a45164fe007db3c0b0939ed2b475f SHA-256: 22a5bd83630bef476c130ff7fe3ba7992b9b89f5ac80a430174d14a6b9b1cb81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of creating a large number of links on low-reputation domains, often used to distribute malware or conduct phishing campaigns. No scripts were extracted, but the presence of many external links suggests a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=how+to+use+facetime+with+android
    • http://gamebonda.com/ckupload/files/53658182561.pdf
    • https://muratay.nl/userfiles/file/42049064060.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/jataj.pdf
    • https://maffart-guy.com/userfiles/file/52567735817.pdf
    • http://eatatrudy.com/uploads/files/23426076214.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/24238020051.pdf
    • http://abwbaltimore.com/uploads/files/63572806713.pdf
    • http://anipetkingdom.com/webroot/img/files/14931401887.pdf
    • http://maimungkorn.com/UserFiles/file/mibeweriko.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/42685273023.pdf
    • https://muahohangnhat.com/app/webroot/uploads/files/mexowerogilaribebajekuv.pdf
    • http://deaprogettazioni.it/userfiles/files/91720086968.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8388d981---30778816399.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138590236fe3---1436683815.pdf
    • https://guineaservicesproviders.com/gsp/files/wugojapiwozevaxuronemiwez.pdf
    • http://abwclayton.com/uploads/files/71228043385.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/bamixuzuvuzo.pdf
    • https://willes-gb.com/uploads/files/202109110245298830.pdf
    • https://travelsafeway.com/userfiles/file/32968057145.pdf
    • http://malovanesklomh.cz/images/file/gotizaz.pdf
    • http://sineadstone.com/userfiles/file/nijef.pdf
    • http://bjaimama.com/data/upload/2021/09/file/202109041838551920.pdf
    • https://asset-books.com/userfiles/file/telorofevirerusijasifasav.pdf
    • http://hoadon-dientu.net/images/files/nokasisepanuzuxumu.pdf
    • http://dhf-china.com/d/files/murukerulusepimumo.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_off0000da7c.bin
0eb6641ed115918a9c1c5fb1f67ef0490dffbaabe43bb2e7e22b028fa6d6aca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 17572 bytes
font_01_sfnt_off00010763.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16792 bytes
font_02_sfnt_off00011f7a.bin
60aeadaf476804fea343a3029fc56c691c24738a26789828850d70541fab8ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 10872 bytes

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