Malicious PDF — malware analysis report

Static analysis result for SHA-256 c294b622ff30dbf0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 04:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9dc79ba24d2e4f8b4e1b04907b34077 SHA-1: 60d54f3b1d90f2e0b9653356d615c40615052e1f SHA-256: c294b622ff30dbf0cb75c066fdf23329dff322787e757eca13d38e7d62e4fc18
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of small PDFs on disposable hosting with UTM parameters, reinforcing the idea of SEO manipulation or content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://waterlootour.com/FileData/ckfinder/files/20210906_9B1D755C4D968CE4.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/14390134926.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/pugoxoro.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/jupijexemenoz.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/99452873993.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/95100471020.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa9731c58---91866653059.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161335dc1f1a28---sikakom.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/8898404390.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/21574007276.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/wekuzozij.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/65178579025.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/1095449191.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93461203661.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/vumupanuwigijikobu.pdfIn PDF document text
    • https://rais.bg/uploads/file/33509343708.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/56166008287.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lufokedajibakad.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/sikezixasib.pdfIn PDF document text
    • http://www.polni.si/Images/files/70771862753.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/tewovem.pdfIn PDF document text
    • http://livilgirls.com/files/26068567471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=positive+words+that+start+with+the+letter+yPDF 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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 10508 bytes
SHA-256: c78df1a2b8bb33971e5b151631467e8cc3d73cb407a30d2c8a4de42fff8a423a
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 18496 bytes
SHA-256: 446f5282aa3f44266be78538e977ce3647a82acc7a76d282f7ba4fc52cc8d277
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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