Malicious PDF — malware analysis report

Static analysis result for SHA-256 21608a5ec1352be9…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 14:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5e5b700a244c9a205c7d835b210c599 SHA-1: 128740da4f5799b47abdd166c041fd88def9018c SHA-256: 21608a5ec1352be933da3aecb14265431b8d7d2435acaa1945fb4bee977c5baf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=jumanji+1995+streaming
    • http://phukhoabacninh.com/images/files/91299760811.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/25413577760.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/49372546335.pdf
    • http://dogomanhnghia.com/uploads/files/99689665162.pdf
    • https://xylemleads.com/userfiles/file/tobuxizoboxufupikej.pdf
    • http://hankyunget.net/userData/board/file/77020779811.pdf
    • https://strechybenesov.cz/content/62307778249.pdf
    • http://okzawidow.pl/img/upload/files/dabadebugunuli.pdf
    • https://sukienmiennam.com/userupload/files/67776622222.pdf
    • http://www.bongbansaigon.com/uploads/files/94341328113.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/tonafosonibe.pdf
    • http://membranekeyboard.pl/_data/file/60901791784.pdf
    • http://nexxstep.nl/userfiles/file/dumasukifajajolufi.pdf
    • http://trivio.it/userfiles/files/84947682040.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/53672228874.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd82f5594c---jijifofudirutepifupef.pdf
    • http://lex.tj/img/file/werusizeluganujijexijores.pdf
    • https://bunyaminerdemir.com/resimler/files/kexuxekix.pdf
    • https://coherence.cz/userfiles/file/96280005958.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/kitamoririzikev.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/32804e979662ffb12d20055fdd7ec927/89944768380.pdf
    • http://efuegypt.org/userfiles/file/waromejakive.pdf
    • http://mamolenasnc.it/userfiles/files/4986302985.pdf
    • http://kzlo.pl/fotki/fotki/file/90944552028.pdf
    • https://malmospelmanslag.se/userfiles/file/nogedetofituterow.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_off0000e881.bin
52a8c3c4b711fd91e19878f1ec02bb38073d9ac1162a43d6846d5eb5b981ed81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10860 bytes
font_01_sfnt_off0001019d.bin
df4b779151319f73b69ade07e409bf447daa1bdbdfe6a294eb4382c21a1cf301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 18860 bytes
font_02_sfnt_off0001331e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16792 bytes

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