Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66994101c77ab54…

MALICIOUS

PDF

83.1 KB Created: 2021-10-04 13:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1b878c274400925f1e61a795c06850b SHA-1: 51d3ed7529eb97e021dac9c58c1495aea2a24cc5 SHA-256: d66994101c77ab5416ef3523bb35c401b271f0d85cee3b63141f4e4f58411454
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=identifying+congruent+triangles PDF link annotation
    • https://camelcarpet.org/d/files/finitefedosejipabofevesu.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/97827330558.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/11982917389.pdfIn PDF document text
    • http://ed-union05.ru/files/file/bemokibejifutatujawaxog.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/58612791098.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/64896472741.pdfIn PDF document text
    • https://motecx.com/images/file/nevowamaguko.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/ganowojixojofiwekabujir.pdfIn PDF document text
    • https://soechi.com/userfiles/file/mugafotulaviladu.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85343898384.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/20121708114.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jinenobadomexuxakisexus.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/koribobewejivuzetokud.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58877355455.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/44114564670.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/13829961632.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631539888.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/61618879657.pdfIn PDF document text
    • http://pnalog.ru/images/file/99016291931.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/safixofedunaf.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a47682b2fb---kurojeminubusajije.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/fozuxadu.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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10816 bytes
SHA-256: b2476d4fd5c3691f870b763c23b99baf2097cbd7e92ca440cb4000e6c90f25f4
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 19880 bytes
SHA-256: 6c9a1efdb63e0d351087b8343b1f0fb776cf64441d028fd356cef9e8e45fb7b0

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