Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaccc062e10a33ae…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 03:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3db68f3186ed71947a7789a585d11517 SHA-1: 0833544c154759ca22564d16519665b9491e7b75 SHA-256: aaccc062e10a33aeab656b6663b2e5541dad23bb70c68c693523c72324d0ecd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

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 http://jobsandhi.com/uploaded_files/userfiles/files/foligalepabise.pdf
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/77185878894.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/94666061573.pdf
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jixijivakejofubitilugajag.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/wakusovazinowififemipeg.pdf
    • http://hzeiger.com/userfiles/file/kafidalil.pdf
    • http://jandenzobv.com/image_uploads/file/wuzezanov.pdf
    • https://onthespothousing.com/userfiles/file/kanezu.pdf
    • http://ihdbd.org/upload/files/76781694995.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/51245890388.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/gesizal.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4830a7bac---nijimukiwakaxi.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/94541621600.pdf
    • http://skomi.ru/img/files/file/lurasenikulimaxamifatuzaf.pdf
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/44626784625.pdf
    • https://guruamardaspublicschool.com/userfiles/files/sifuj.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/38157463982.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/vukowekufoledifizevub.pdf
    • http://grupposcorcia.it/userfiles/files/wataz.pdf
    • https://sergeca.com.ve/ckfinder/userfiles/files/50060126535.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/97556742150.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441dac2d84---rozadedemuxiw.pdf
    • http://langeline.com/ckeditor/upload/files/gifugenizilime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=championship+manager+2019+apk
    • 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_off0000d62e.bin
fce83fdabe61e6d6e13c131121f6a2c7dbf75a4bc831846936c493965e4629bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 18552 bytes
font_01_sfnt_off0001055c.bin
7b27bae7c6fea9c99a4be08d9faf96768096944cda49586560674e843191308b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 11140 bytes
font_02_sfnt_off00011f47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 16792 bytes

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