Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558288fec5eb6e9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 01:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06fabf9455ceafa6c568e4ee2ca882e0 SHA-1: 6674f11178c42f6175f874bd4e8128f5119b2c25 SHA-256: e558288fec5eb6e94b91d198a56518aff129d4dfc7a518d15f87d29cd64cc020
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests a link farm or phishing attempt. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=perfect+beauty+camera
    • http://agro-norwa.pl/userfiles/file/juzujadafanaru.pdf
    • https://coffeetuanvang.com/Images_upload/files/kijakaxote.pdf
    • http://pwmtqatar.net/userfiles/file/tofun.pdf
    • https://timminsrenovations.ca/file/a4qZAElD7Hcpj7RL.pdf
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/80937413892.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kibiloxemowajidevokavariz.pdf
    • https://ssmavidiyar.com/public/content-images/files/71385580046.pdf
    • http://naturalwonders.com/uploads/files/warutakisiwomaxusavimu.pdf
    • https://penzionradvanice.cz/res/file/nibowugitukexe.pdf
    • http://falegnameriacastiglione.it/userfiles/files/gesugizupiwukunelepubi.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210909_041958.pdf
    • http://szakkepzosiklos.hu/upload/file/pipukifiwojugivajejufuso.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/13443799464.pdf
    • http://mestav.sk/uploaded_images/file/sodabekef.pdf
    • https://produktybhp.pl/pliki_user/File/49029595763.pdf
    • https://kalimati.in/userfiles/file/98774119898.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_off0000ba44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 16792 bytes
font_01_sfnt_off0000d25b.bin
5ffce05f7582ed94b39304eeae8a9c00f6efeb8646e1838b0d887bb21a27591f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 10320 bytes
font_02_sfnt_off0000e9c0.bin
3b441343e945add9a15f093289266b88db02a7a5cfa1e9305182304ecfbafe33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 16912 bytes

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