Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef5ce2905df2388…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 05:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22539ec0b54b2a387385637b9e777f27 SHA-1: b59a4f3172e1c3fbedebb45a3ca9b7d42d79b172 SHA-256: aef5ce2905df2388316798e6505f4f58b8f04c35d05ee4572cafc5ad622a2de8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains designed to host files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting a malicious intent to distribute payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=caldav+android+app PDF link annotation
    • https://pearproperties.in/userfiles/file/rejufatevumugonemufo.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/sakaj.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/88023197537.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/wenefolakedofapeven.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/somebivijusabupuguwutegos.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/sabezakemogubebaxebud.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/5271476024.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/94733045681.pdfIn PDF document text
    • http://artediapharma.com/upload/files/kanusiditemosusitugidavog.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308340946344.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021921818404441.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/malomitifasi.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/gemowega.pdfIn PDF document text
    • http://geotersrl.it/file/5821547265.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/zerinivulobo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f1531a5aaebf142e9add0d571900db33/90297185608.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210920103155_2nsneu.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/65337689581.pdfIn PDF document text
    • https://webmenuplus.com/images/file/vegesuxudarulesupuniduba.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/pejugevifiriwubeso.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/196c14b2f59a299783058cdeda0372ba/48507650349.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/tofidasafer.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/xuloguwilimejiriritudi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 17424 bytes
SHA-256: 19953cbabea4c91295d1895d6a93e87edc6520f4dd97ea9a7407712920658dd1
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 10084 bytes
SHA-256: 6c25115ce76acd50905e90b95173d012cebf92bd1e5f1784771b4124565fdd0f

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