Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8384d8cc7df86a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 22:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81e40ec0df34b961d0775ffc3bec94df SHA-1: 1a88c6b27fabd610fe73ec4b2a7207dec86198f8 SHA-256: 9f8384d8cc7df86a31629f84b3ab6c7758196713db7fa11b841df5fe6e368474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a redirection mechanism to malicious sites. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=everything+i+never+told+you+pdf+ajay+k+pandey
    • http://www.tivafa.hu/upload/file/wivizovibafugurigisijoga.pdf
    • http://liavanhaeringen.nl/userfiles/files/91245205785.pdf
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdf
    • http://dkkarsin.pl/img/upload/files/88149870967.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/58396228948.pdf
    • http://lacasedescaraibes.fr/file/dofajer.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/957c409788a3b4fd0840d811f9ece6aa/72704000642.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/50213030898.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/jofujateminat.pdf
    • http://polipadel.com/userfiles/file/texagati.pdf
    • http://k2plusinterior.com/userfiles/16484172563.pdf
    • http://soleilboo.com/images/uploads/files/85293417890.pdf
    • http://budaors.varosom.hu/userfiles/files/wexifozufevolug.pdf
    • https://iveducentar.com/uploads/assets/file/66873400892.pdf
    • http://restauraceeverest.cz/userfiles/file/7887390920.pdf
    • http://bige.vn/uploads/userfiles/file/82543101448.pdf
    • https://fratellifurloni.it/file/48899064138.pdf
    • http://ever-pioneer.com/upload/files/dijowoguvev.pdf
    • http://gancza.pl/userfiles/file/narujipib.pdf
    • https://ahha.az/userfiles/file/papomorebe.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/xupusaluxakololos.pdf
    • http://risorsaterra.it/userfiles/files/51339684631.pdf
    • https://rajakedua.com/contents/files/nodaremibajukud.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_off0000d758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 16792 bytes
font_01_sfnt_off0000ef6f.bin
5f23e5676de5b8e9313e0adef5de78cb2cd3abd408175fdad7149a973d496ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 11092 bytes
font_02_sfnt_off000108fc.bin
71e233cdd413d86c14a2f188b6c7f7d417c14b1e31cf01a5c22330f9656e9300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 17824 bytes

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