Malicious PDF — malware analysis report

Static analysis result for SHA-256 5437ba47c58470dd…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 20:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44372cdff80d9c8634f897729b5b5473 SHA-1: 4907e4234f07d71c92cfdbf78096926eb0def726 SHA-256: 5437ba47c58470dd5f1b65ea1445a05f1dac75210e0e4b806965a6775f798dfd
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to obscure malicious destinations or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://p-jtech.com/userData/board/file/96244712594.pdf
    • https://zooiguana.pl/app/webroot/media/files/90742051239.pdf
    • https://nyirfa.hu/uploads/files/mabonixag.pdf
    • http://amsaneeraus.fi/userfiles/files/99997950193.pdf
    • http://kammed.com/userfiles/file/48966794719.pdf
    • https://alajuusa.ee/media/contents/file/98382485541.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16141b024a95ae---42913086726.pdf
    • http://tdsns.ru/userfiles/file/23132681438.pdf
    • http://bradzo-ep.com/uploads/files/xomogemepewagitunaxarit.pdf
    • http://forter.vn/hinhanh/file/53837234422.pdf
    • http://djk-winkel.de/images/uploads/file/bumotolupafevikuli.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136c2961b54a---45623221480.pdf
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/tekudofitijapa.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613375ff38ccf---79724530704.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/guzopofiniwopuvuvew.pdf
    • http://fitsiluet.cz/data/file/vavemepeje.pdf
    • https://rimsball.com/ckfinder/userfiles/files/85078272749.pdf
    • https://hanoihome.net/img_duhoc/files/patudumagof.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/16188385501.pdf
    • https://receptabc.hu/images_banner/files/safesuwaxot.pdf
    • http://aexpress.lv/index/images/up/file/tujogowivodagiw.pdf
    • http://ocvitlucky.com/vietkiendo/upload/file/52660922816.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/wovozibuzul.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/60603886017.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dungeons+and+dragons+solo+adventures+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_off0000ed2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
font_01_sfnt_off00010541.bin
6fd492e8e4156a5a5453eb1956a3079d553fe29a18c4029f73c915570d125ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 10748 bytes
font_02_sfnt_off00011df8.bin
26edc538014d081bfa7e59d5fcb91157132f44c230b7a71ec33dfdfc4d4536c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 19156 bytes

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