Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3d0396328ee68…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 22:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d9c94249daa78b202612efabcfd3191 SHA-1: b14faf3e39435b23e179995f5508caa0f0bbd150 SHA-256: c5e3d0396328ee6834795c017b9b3b388372fc563f00df0a15a560c15653b4b4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm designed to distribute malware or conduct phishing. The document body is heavily obfuscated, preventing a clear understanding of its direct lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326b80506b0---kenilimuputimolorujosil.pdf In PDF document text
    • http://vetcasatenovo.it/userfiles/files/9734526169.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/lativikitewipinuvegules.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/54971953380.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/fikazab.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/77497547357.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f0e73ef10b17431d49f41a39d1defda2/21983684442.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/tubefapazuzusimuwuzeni.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/34613312389.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/22417141837.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/gigibodusefubemetobukomi.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/wiladiwolev.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/80385773497.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/41661251493.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/labarobopujibesod.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/giduxowozupitipev.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/87679169473.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/kagapefasafana.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/23039633767.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109120615108975.pdfIn PDF document text
    • http://www.heksan.com.pl/file/75683971618.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/kabuzigisexololeligu.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/9339857932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+randomize+a+pokemon+game+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10748 bytes
SHA-256: 02310ab0bf63593f989d1155f626438ba6e17809e232c0fde114086b57e6bfc0
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 17588 bytes
SHA-256: 02fa064494ac395f9c1c6e78e72cfcc5b1fd51f18f767cdcafe0c4ee56b6478d

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