Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f8d3ade68ce228…

MALICIOUS

PDF

77.8 KB Created: 2021-10-10 04:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d45138a482ca4c78321a99a7cdd12a9 SHA-1: 624f73ebf820c78ba6e1f7d2e0e5c6ba05ba7263 SHA-256: b4f8d3ade68ce2281e23e10c51fba0e2618196c1bd01e538fabc371f9caf040a
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which are part of a link farm, suggesting it's designed to lead users to malicious content. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, specifically instructing the user to execute commands, which is a common method for bypassing security measures and delivering further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://abwingssuffolk2.com/uploads/files/pikifizexamajubusuv.pdf
    • http://ocung.net/img/files/79921211615.pdf
    • http://xszhuhai.com/uploadfiles/files/19668880026.pdf
    • http://qiangka.com/ckfinder/userfiles/files/20840104219.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/50262699554.pdf
    • http://wowbond.com/upload/Fckeditor/file/subaguguno.pdf
    • http://ideatity.com/ckfinder/userfiles/files/14095843996.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee367a63abb3226f51740aada3a6312f/52142503758.pdf
    • http://m-s-g.ru/userfiles/files/73077529264.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/58510426025.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/zokukumumajojitiganusur.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/11788762417.pdf
    • https://yam-token.com/business_school/uploads/file/84736858811.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/69112696491.pdf
    • https://loyallcanada.ca/editor_files/file/26694754432.pdf
    • http://www.greenfield-sustainability.com/images/files/wuladukiwukok.pdf
    • https://proxkimya.com/resimler/files/bujewafawevopemarowe.pdf
    • https://excellencetogether.com/img/files/file/jiwiwarovewebotamoferag.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/xodixi.pdf
    • http://thechelseaff.com/user_uploads/files/wisofinemufotojoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+num+lock+button+on+a+laptop
    • 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_off0000c896.bin
e487658d7aaca4c4dd6bf362d592c9ba87515bb7515998a95555e4babdc6bdcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 10864 bytes
font_01_sfnt_off0000e151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
font_02_sfnt_off0000f963.bin
49d1e5bd0abc53a93592e49c0d79aa4d9a93f8119e8ae54c40b2d4b2caef07bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 18684 bytes

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