Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c166f5673cb476…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 05:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41c97fd6a7e0bcb6274ee46084b5db89 SHA-1: d049fe0ceed2f04960a011f81bfd6b31d3eecf1b SHA-256: a1c166f5673cb4764230888f91a7e5051ca02f9a3539b7e55231797a15761e3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. The primary attack pattern involves luring users via the PDF to these external resources, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=pes+21+game+download+for+android PDF link annotation
    • http://circuitoinsulargc.com/documentos/file/3430783578.pdfIn PDF document text
    • http://laduses.nl/image/file/13552409276.pdfIn PDF document text
    • https://red-adlay.com/upload/files/piwavosonapi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/pedipisomu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/finarasokozibuluroril.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/7275079178.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/11672fda7919db190bf6634fe65aaabc/nojapebudupabidirotebajor.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/noxejikatozukumejapo.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/46347362331.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pevetoluboxekutugeku.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/65729742162.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4614b06bacf6adc82e789b1371829dd0/49988800969.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/58326301845.pdfIn PDF document text
    • https://bursac.net/userfiles/file/mafivipoga.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/belidukotiwi.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/puwolarafowovolopezaxa.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/20142873102.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bevegarirovizuden.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/86437308032.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/31055103060.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vafubusimavi.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/39529051914.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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 14976 bytes
SHA-256: 3d8af6ef5da01fc1ca5e34b0d612f756d29dc085c105a9a961237ac767488f96
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 10860 bytes
SHA-256: 2f5a7b60118d6fb1fefd5d2880753b03f9c60007d013aa1eb02499628f4830b3
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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