Malicious PDF — malware analysis report

Static analysis result for SHA-256 938a28e46cb4ae9d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f03bc0348f1238664899aba6d29ccaf3 SHA-1: 58af552fb22020f01b7a816118a00c3642d0beb8 SHA-256: 938a28e46cb4ae9dc0277790b0e37d537701918356e404c38936936b703fc46d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm and potentially malicious. ClamAV detection and ML classification strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=transfer+photos+from+android+to+ipad+via+bluetooth
    • https://www.hkha.com.hk/ckfinder/userfiles/files/xotiremifedepige.pdf
    • https://amrapalispot.com/userfiles/file/piwimaviwubikoligudokemax.pdf
    • https://pasarangroup2.com/contents/files/63508968554.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/pezugepofekikofikax.pdf
    • https://sunpower.lv/ckfinder/userfiles/files/mevisujexotolakopokotug.pdf
    • http://karinameal.com/imgdish/files/woxozu.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78603360860.pdf
    • https://at2-turbo-j3t.com/contents/files/rarugajapofugudunuwelefu.pdf
    • http://eprdel.cz/userfiles/file/38198951441.pdf
    • http://446888.top/userfiles/file/95562265105.pdf
    • https://empresa-venta.hr/files/32736611196.pdf
    • http://jinyezi.cn/upload/42030487373.pdf
    • http://inbiosa.eu/static/cfiles/files/lemugopi.pdf
    • http://flygarfield.net/userfiles/file/dugebajuzafe.pdf
    • http://skybuildinfraprojects.com/uploads/60195515772.pdf
    • http://www.dean-cpa.com/files/adminpic/file/40533239056.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/babadodifefobaligune.pdf
    • https://toscanafantastica.com/userfiles/file/47767951291.pdf
    • http://garage-fuji.jp/js/upload/files/16559304162.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd4ab741---tirivekinof.pdf
    • http://bilcafe.it/userfiles/file/gigizejogegifebobe.pdf
    • http://iwort.de/userfiles/file/94657251168.pdf
    • http://ladna.pl/user_images/file/59837968627.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/6458180621.pdf
    • https://airin.lv/images/userfiles/file/60330846728.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_off0000e101.bin
5ab075d44e50cb3f422900b6794c552f18897751ed140f1fa9135321a5c6bec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 11032 bytes
font_01_sfnt_off0000fa3a.bin
8220243340ceb16e8941b7eca784b757d167cd7bd26dc71b6341a20ca52741ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17208 bytes
font_02_sfnt_off000126b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 16792 bytes

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