Malicious PDF — malware analysis report

Static analysis result for SHA-256 04182a3c1442c4dc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 02:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b2f608f75922b06d3a6daf17234c6fd SHA-1: c596392590b5f58bea05cfbb4329faf7f720fae7 SHA-256: 04182a3c1442c4dc676624742e4426b3d47fe349dc782be6b2a9e1258bef1889
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of a link farm with numerous embedded URLs, many pointing to unknown or potentially suspicious domains, suggests an attempt to lure users to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a potential tactic for distributing malicious content or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mynigaoe.com/upload/file/20210917045109.pdf
    • http://annabarons.lv/files/files/guborakosovupugin.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20210911_175736.pdf
    • http://uptownherndon.com/uploads/files/59787076050.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/nujulajuw.pdf
    • http://video-cycling.de/files/file/zazageja.pdf
    • http://murielbellhomes.com/userfiles/files/88494147406.pdf
    • http://hla.vn/upload/files/4563017646.pdf
    • http://baobianhkhang.com/upload/files/namovomoditego.pdf
    • http://namkhoabacninh.com/images/files/54832077815.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418fa659f84---92612979242.pdf
    • https://living-stone.lu/userfiles/files/77474232166.pdf
    • http://salwex.hu/file/xizabonetodof.pdf
    • http://boki.hu/editor_up/85875750926.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/49863112452.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0bdfb6ca5---5360359613.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/88260375282.pdf
    • http://riversedgefm.com/files/file/31645060508.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/lutike.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f23ca2e85---wiketobis.pdf
    • http://singer-island-condos.com/userfiles/files/61269617482.pdf
    • https://quatcongnghieput.com/uploads/files/25618097417.pdf
    • https://netlandschool.cl/files/vapegipotudiw.pdf
    • http://enjoy.sk/editor_uploads/system/files/pedigabijugaxibe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+set+vpn+for+android
    • 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_off0000db93.bin
aabae315e20d59167f1b598457f6f1ba26c750222a6733d912bb1431d288f882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16912 bytes
font_01_sfnt_off0001071a.bin
e013ddd24a9382f7c957f783d98d0adccb2fc340673184ac5676e9f8f480849d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 10588 bytes
font_02_sfnt_off00011f72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F72 16792 bytes

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