Malicious PDF — malware analysis report

Static analysis result for SHA-256 b764b1e3263f850e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 17:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66f84b94b12a8b59a886ed9c6d578bf0 SHA-1: 016d30a935b467834bc6c5e2ba1a3163119b3ebb SHA-256: b764b1e3263f850eca205cb2845b0950641ffcba5b110e1d81c0e3371f30748f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://giaphatmed.com/upload/file/16632235990.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/92471018232.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb6e52788---28013353723.pdf
    • http://fantacyhandicraft.com/userfiles/file/59245833442.pdf
    • https://radekslodkiewicz.pl/files/file/58415967856.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/577760388.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c0f68eee---16634220622.pdf
    • http://ekvatorbl.com/userfiles/file/90718049662.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/66695577093.pdf
    • https://inmaabiladi.com/userfiles/files/botamokikajiguvagu.pdf
    • http://fskyok.com/uploadfile/files/dodibe.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/totuxuxon.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/rujevokan.pdf
    • http://sbs-group.co/userfiles/files/sopijaligumetirujorepan.pdf
    • https://soswzgierz.pl/web/uploads/files/2802548094.pdf
    • http://wangguanhardware.com/userfiles/file/xixolakapot.pdf
    • https://mehreganimaging.ir/images/upload/files/vodefumuzesadadatidotilim.pdf
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/38270168042.pdf
    • https://auto826.vnpec.xyz/uploads/files/vurigiziporaxarovaba.pdf
    • http://borik.customreal.sk/data/files/falojujipufulov.pdf
    • http://cioccolatogallucci.it/userfiles/file/62953780410.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kinemaster+pro+apk+for+pc+windows+7
    • 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_off0000e1ff.bin
1d2fc118408642c0c39aa16260dc09c8fec32cece709a8c1945e717231c42aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 10952 bytes
font_01_sfnt_off0000fb83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
font_02_sfnt_off00011395.bin
640fa72fec5453920906bedc63a175b340bbd69f37aa9ea102be5cb3dafd7d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 17968 bytes

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