Malicious PDF — malware analysis report

Static analysis result for SHA-256 516a86c47e6e6aa2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 04:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d38145f7e4ed976514eab4ac6726638 SHA-1: 3ec9c5cfc187d4add7680328c985208206d83133 SHA-256: 516a86c47e6e6aa2ec14245d2838fd566836016dd72a8550e749cf001ff7f046
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of numerous external URIs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://drafthe.ru/uplcv?utm_term=best+website+to+watch+live+football+matches
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613090cf1ae3c---lufujitimivavoxunaf.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/86079496877.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/sidelepobi.pdf
    • https://thietbivesinhanhhuy.com/asset/files/55364353478.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf175aa4c7---88731623021.pdf
    • http://windmill-bv.com/userfiles/files/sozufelubupunijosolido.pdf
    • http://svazekobciorlice.cz/userfiles/file/21893279065.pdf
    • http://barcelonasixtytwo.com/userfiles/file/gelotun.pdf
    • http://healhumanity.foundation/userfiles/file/1311629984.pdf
    • http://adgroup.co/userfiles/file/jurov.pdf
    • http://kfbma.org/files/fck/file/93081419983.pdf
    • http://realtor-madrid.com/uploades/fckeditorfile/xafijikozeparotoku.pdf
    • https://ikorti-iao.com/userfiles/files/21188552469.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fofetuwovipegilelif.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/89576086003.pdf
    • http://roseeskin.com/userfiles/file/20210903233431.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/bokorezexufiki.pdf
    • http://lsmtrontractor.com/upfiles/file/20210904145139.pdf
    • http://shippingengineering.com/files/ckeditorothers/37607307314.pdf
    • http://dentalclinicbangalore.com/uploads/wiwagotoguxadasexopov.pdf
    • https://zoldlaptop.hu/ckfinder/userfiles/files/sakukosilig.pdf
    • http://vinczeandlaszlo.com/upload/82543777849.pdf
    • https://newcar-rental.com/uploads/files/202109150558136431.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_off0000ae37.bin
6a519bf128a45e5f2e5f193e05d8a86cfc804d71741bbdf5b282d3d4705e5835		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE37 15676 bytes
font_01_sfnt_off0000d60e.bin
bdd02a618cc56306d74e21be13629f4d489acbcd0020ddca3c2667360ed3b8d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 10740 bytes
font_02_sfnt_off0000eee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes

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