Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4a81ab7179d7c2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 13:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13a9f591dd4b9d8730cf9ce845bc076a SHA-1: ce7b06ddf7a9da4cded2267b6bf8dd01e5a846fb SHA-256: 9c4a81ab7179d7c25ee660043aabacd10fc501d402c8c057721f7f736ff07eeb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on low-reputation domains, likely to host malicious payloads. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jiji.pgo.tw/pic/uploads/files/44390719833.pdf
    • https://biocenfis.es/uploads/assets/file/gutubofopil.pdf
    • http://precisao.org/files/files/semusalaretekevafov.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/nomikuzobapokifirojobope.pdf
    • http://bielle-srl.com/userfiles/files/98225823342.pdf
    • http://wonderpanel.com/app/webroot/img/file/94024893532.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/5255725268.pdf
    • http://sk-massimo.com/js/upload/files/56756237742.pdf
    • https://ruh-center.ru/userfiles/file/60216467845.pdf
    • https://rotitelor.com/contents/files/63505022834.pdf
    • http://wooshin.kr/uploaded/file/12115155066130cfe934fa4.pdf
    • http://kliknetezde.cz/admin/obrazky/file/33808347299.pdf
    • http://karthikeyanjayaram.com/userfiles/file/25339449452.pdf
    • http://gsmontaggi.it/userfiles/files/gimusugabexekudezasedulo.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/lurimevinozasop.pdf
    • http://flexa.cz/docs/file/83517454126.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c140eb4d8---77413886818.pdf
    • https://teamcode.net/upload/files/jekesanuxasibopafa.pdf
    • https://itchanoi.vn/uploads/news_file/82286470736.pdf
    • https://jobtiara.com/files/files/burifulivimegotujezesofu.pdf
    • http://ncdesign.it/userfiles/files/67022340139.pdf
    • https://henseltech.cz/userfiles/file/liroga.pdf
    • https://florissantdesign.nl/docs/Image/file/kibavedigofagidogabuso.pdf
    • https://magnanelli.com/userfiles/file/nuwawipinebevujew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=controller+support+genshin+impact+android
    • 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_off0000d53a.bin
df8f17353bf08ada40e611acd1b220edbb362dc936c669ab200197525ce9431f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 11092 bytes
font_01_sfnt_off0000eeb5.bin
9d8c8941156bf6e23ea4d4b6eed76fa2a4c03e9254bf5f6925b1233f7047648f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 17776 bytes
font_02_sfnt_off00011d5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16792 bytes

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