Malicious PDF — malware analysis report

Static analysis result for SHA-256 717a2d7035a09976…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 10:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55cc6014742837bccd0b360bf0b051c2 SHA-1: f3f24373773d6e21c47dd3f04cc6520de94f00ba SHA-256: 717a2d7035a09976a8930369554aa5eb4277f1eebb817d96a8c3ea9d223fc373
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a focus on redirecting traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=peter+rabbit+lk21
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/26334193181.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64175699439.pdf
    • http://kidsjeodo.com/images/files/30296715509.pdf
    • http://enjoy.sk/editor_uploads/system/files/tuzarekulapifisakelisavuz.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdf
    • https://big-affaires.com/img/pics/files/30594363600.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ro6f3qt3b8ev2fnvlfekktgbs0/15039985711.pdf
    • http://galerie45.com/userfiles/file/46177452458.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/79271961857.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/19177021237.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vofofovewagag.pdf
    • http://showdoimovel.com/files/files/vosaxuvazupuxigemenod.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/vaden.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/kupejowefidiximepax.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fixudejudinatub.pdf
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/66542323177.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fasozezetuwanurujalotutij.pdf
    • http://scandirent-new.ru/uploads/assets/file/topunidigufukuvi.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/lasisazuma.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/ratusujojopakoke.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210914_141558.pdf
    • http://abwmountvernon.com/uploads/files/vinetamaxikesaronozal.pdf
    • http://autoscuolavalerio.it/userfiles/files/99416626629.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_off0000b35c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16792 bytes
font_01_sfnt_off0000cb73.bin
f7007633beffe7a805272e808ef32bfa5221f54bb2fe7480e7e9b168461f1f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 10112 bytes
font_02_sfnt_off0000e23a.bin
07d4eb30b228920aa5c1fd9815f2f0cfff3260af615082747913cf486d7e66b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16908 bytes

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