Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17648ee6e9d7d95…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 20:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7992d1a145146d3b6efda55400cd423 SHA-1: 3452f7beaaa1b0b0ba6dbf9628631164d91a1216 SHA-256: f17648ee6e9d7d9598a96b4180f1cd0d86c3f0e04f226d15f81976f020fc8287
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of external links, many pointing to unknown or potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://imahima.xyz/js/ckfinder/userfiles/files/55734720318.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/lorafedetu.pdf
    • http://studiopiergentili.it/userfiles/files/fasawemuzawuvomudaki.pdf
    • http://evaemlak.com/userfiles/file///meram.pdf
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/joxoxipotiwo.pdf
    • https://pima-alarms.rs/slicice/file/32264291585.pdf
    • http://papinchess.ru/userfiles/file/70830454911.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/682916836.pdf
    • http://shopphutungmayphat.com/upload/img/files/jupatozon.pdf
    • http://marikitaberbagi.com/userfiles/file/bogul.pdf
    • http://ymjgolf.com/file_media/file_image/file/23537611793.pdf
    • https://newline-eg.com/userfiles/file/10197419347.pdf
    • http://ventexevent.se/uploads/file/vakipeb.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613515a529df7---9114570153.pdf
    • https://matraci.info/UserFiles/File/64253567867.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e60af493---35242730610.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/dewij.pdf
    • https://thietkewebseo.com/webroot/img/files/xinunem.pdf
    • http://morgancountyoh.com/userimages/56464184740.pdf
    • https://at1-turbo-j3t.com/contents/files/guwepuxozuwijoduvodib.pdf
    • http://fatamorgana.fr/uploads/assets/file/sezarotiso.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ruwilileduratixaxokipi.pdf
    • http://www.vegagastro.pl/upload/file/69403148670.pdf
    • https://anna-bel.com/app/webroot/files/userfiles/files/bumosizoduladof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=triller+fight+club+live+stream+free
    • 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_off0000bbf1.bin
365056e4fb1152fe379c5fcb0960678334ca9db2bc7b3cba8e9593e25cea3193		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF1 10828 bytes
font_01_sfnt_off0000d4f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 16792 bytes
font_02_sfnt_off0000ed0b.bin
2e8ea7821d1e29f00bda0cd874bda7f6dbb6b6b53ff4d798ba7af2b6a124e56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 18832 bytes

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