Malicious PDF — malware analysis report

Static analysis result for SHA-256 23869388e15aabc3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 01:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62d0b7f50ad56655e13d4b07aa95508a SHA-1: c85160e6b58c277e28e1d8fb4358fbb5071993fd SHA-256: 23869388e15aabc3afbde4321c5fab7ec2d2c22c315e785640530cf003aca91f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://debcopharma.com/userfiles/file/gexove.pdf
    • http://czdashan.cn/uploadfile/file/2021090601194773499.pdf
    • http://baozhaopharma.com/upload/files/99501584938.pdf
    • https://wonwon.taipei/photo/file/43340805084.pdf
    • http://patanamachine.com/imgUpload/files/48590497543.pdf
    • http://biurod9.pl/public/userfiles/file/94543830845.pdf
    • https://rajatotogroup3.com/contents/files/7475246985.pdf
    • http://metabolit.ru/files/file/malawi.pdf
    • http://gaudi.tw/upload/files/miperekupavesubapux.pdf
    • http://movitecnic.com/ressource/site-image/files/91602878459.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/96653638580.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/33149494651.pdf
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/81747200260.pdf
    • http://hsound.ro/images/custom/file/jogapatibazijinijuriti.pdf
    • http://agama-rc.com/upload/files/23813244814.pdf
    • https://gogift-it.com/userfiles/files/69080989576.pdf
    • http://mexxeopaint.com/upload/files/zidukalifizomife.pdf
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/kekuwowerugogepevixo.pdf
    • http://wedooverseas.com/userfiles/file/werarare.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/foxof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+trim+video+in+mx+player
    • 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_off0000d581.bin
e4f32c029c367992c77a64236da857b57fef1df2833c8ca125d3fc978b538859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 10744 bytes
font_01_sfnt_off0000ee29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
font_02_sfnt_off0001063b.bin
cdc8eadbb97b7cff4e28a77b013cddf211950649172cdcd5bb20955d2536513d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 17396 bytes

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