Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a48cffe06040c2f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 14:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f856b784483e641905013a831aae75fc SHA-1: 41d24ecdda7ae39a426b8e70e0c54824f67a00d8 SHA-256: 8a48cffe06040c2fdd8f7da08e53c85d1c62dc8e6e5b50ff8b0cad30516ee863
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdf
    • http://giayviettri.com/img-ftec/files/37848872455.pdf
    • http://improntediteatro.it/userfiles/files/71831758132.pdf
    • https://rh-h1tapi-turbo.com/contents/files/50018335714.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d1c91d541457515289dd4dce736439b7/25809055858.pdf
    • http://peneleos.pl/userfiles/file/82203628082.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fc2d2ea6d---zejawigubafulesuzilepikev.pdf
    • https://kapefashion.com/files/files/57344544784.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/rusejolumidafovidawud.pdf
    • http://kmbb.at/userfiles/file/11159132794.pdf
    • http://prosquash.by/data/wekuvuge.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/nipozenikogaruxe.pdf
    • https://zenithoverseas.com/assets/userfiles/files/sabokugabufom.pdf
    • https://bhiringisamsankalimandir.org/userfiles/file/73009759778.pdf
    • http://hp-cnc.de/uploads/files/fisigep.pdf
    • https://kurtoglumob.com/upload/file/zokolunasokezi.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/44691990343.pdf
    • http://freestyler.cz/img/file/terejon.pdf
    • https://media-get.ru/userfiles/files/sodusuzinoxanidonur.pdf
    • https://mclandpin.com/calisma2/files/uploads/luwakefisod.pdf
    • http://potentialdesign.cn/userfiles/file/1630542056.pdf
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_032903.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+recover+files+from+android+after+factory+reset
    • 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_off0000c1a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 16792 bytes
font_01_sfnt_off0000d9be.bin
1bd60cbf647fa2e4da8b463ef7545a1958d7a89c8889631b80cc8080514699d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10892 bytes
font_02_sfnt_off0000f2f8.bin
d552373d4f5154495466c459fc2ca7cb7faab0b1f32f4d330a82b07f540b9463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 17896 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.