Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02475613f88b374…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 22:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c773c228db559ecb84e8c1072a438f5 SHA-1: b50807a7a0b1601f0a503242bb814ead60a43f61 SHA-256: a02475613f88b3745519d7cb5bdb93253dd21105667fb92a6fb53fba099cd007
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://laborke.ru/uplcv?utm_term=game+turn+based+android+offline
    • https://careerroots.net/ckfinder/userfiles/files/sedeturel.pdf
    • https://calson.garment-pro.com/ckfinder/userfiles/files/99409378388.pdf
    • http://kesherisrael.com/uploadEditor/files/27903445024.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be7c30987---54273399059.pdf
    • http://logopeda-empatia.pl/content/file/limokavudipufevaxirak.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/lanusenuratolopidufaki.pdf
    • http://modulobase.com/userfiles/file/tulexapokijivut.pdf
    • http://vinhosnorte.com/images/files/3973050302.pdf
    • https://rabudiagnostic.com/userfiles/files/64612303815.pdf
    • https://koratspring.com/upload/file/wewufidove.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/59496533369.pdf
    • http://www.vikingmaterials.com/img/55398104549.pdf
    • http://acsalma.hu/userfiles/files/2142713670.pdf
    • https://remini.hu/userfiles/file/64547102315.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/filiz.pdf
    • http://cbgnfinance.com/userfiles/file/dujimarimafagesaji.pdf
    • http://terremeraude.com/userfiles/file/96412470310.pdf
    • http://ameshamagazine.com/js/upload/files/safawonuliki.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/857889707.pdf
    • http://drzwiukryte.pl/userfiles/file/zowasu.pdf
    • http://tantos.jp/js/upload/files/luloganuzifivo.pdf
    • https://bczenekar.hu/files/file/5468635941.pdf
    • https://mtestbd.com/assets/uploads/files/56404949188.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161316d128a1ef---nifafezo.pdf
    • http://moscowfashion.net/content/xuploadimages/file/tuxaxojerelijet.pdf
    • http://benthanhsgfarm.com/images/uploads/files/40478245035.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_off0000f3f3.bin
19861b5460c1faac4f43cef7cad972f8ae1198df9625e4724ff35da95ef0609c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 17296 bytes
font_01_sfnt_off000120c9.bin
3e1bf6687c0f9033d74a80cdbeb1b8e4b92fdc6c2028d61cd0e86480c2a2f741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10792 bytes
font_02_sfnt_off0001399b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 16792 bytes

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