Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a10bbe4b3db1fd3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 15:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bb55e4ba81b3e9807aa7fae87b322ce SHA-1: 0eab81cc7ba5811a096117c7f9fabee9291a5d3a SHA-256: 9a10bbe4b3db1fd345f8d16685b12dc6e9d348c7df498b81fca34e545508781b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the suspicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=android+10+go+edition+review
    • https://gegeny.hu/uploads/file/2006658197.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16133622b0e701---45320667171.pdf
    • https://globalathena.com/ckfinder/userfiles/files/2858144808.pdf
    • http://vdi.vn/userfiles/file/gopatigofusekabedolubo.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/murizuxijemaxog.pdf
    • http://www.pattyn360.com/upload/forum/files/45022583121.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/74215762438.pdf
    • https://jamuiboe.com/webroot/upload_media/59241816798.pdf
    • http://dentherapia.hu/files/file/26173980452.pdf
    • https://themalc.org/files/file/80822144661.pdf
    • http://somsit.com/ckfinder/userfiles/files/92596500952.pdf
    • http://parateam.cz/file/65425354129.pdf
    • https://plasy.com/uploads/file/pojiniliran.pdf
    • https://alakharia.com/public_html/userfiles/file/wibaporuduwa.pdf
    • http://cdkuys.handysociality.com/upload/files/jiwaxodobowivetulupape.pdf
    • http://yilip.net/userData/board/file/juwetalos.pdf
    • http://dongsimkindergarten.com/upload/files/99446395186.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/gakijalo.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/77273161633.pdf
    • http://fd-health.com/upload/ckeditor/files/zovadodivusopaviraxim.pdf
    • http://newgatedesign.com/Images_upload/files/miruvilavosaxuvedavaze.pdf
    • https://mertlakustika.cz/images/pages/file/baxukexifik.pdf
    • http://barbusci.it/maisUserFile/file/pekokivitoro.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/wumagujo.pdf
    • http://alwaditrading.com/userfiles/files/zudaluwogesurodupe.pdf
    • http://playoz.com/ckfinder/userfiles/files/bititojedukevowitaluxuki.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d555dc44---50326683639.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_off0000d30a.bin
f4f846c4b6c033a353ea4cf42cd1daf9df979715ec52fce9220dc6550afd8d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 10352 bytes
font_01_sfnt_off0000ea67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
font_02_sfnt_off00010279.bin
eddb23c25a558c396a397861a0f4f477d0c3b33a835a7949d39af780d6835b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 17580 bytes

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