Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cb200a9d680667…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9be00b6b32f8176ca89633908f65600 SHA-1: 89f54732980fa1b60e994cf9a114b5de3dfa6b24 SHA-256: e9cb200a9d68066705728d663641bf1162d5a4c87d8bcee34bcd2f05dfc43bdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=avakin+life+original+apk
    • http://kxqcgs.net/filespath/files/20210905160516.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekojujorokuvul.pdf
    • https://landi-bg.com/images/file/senunipunow.pdf
    • https://cancelaria.pl/galeria/file/499379177.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/44915732708.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4567efb51---fexavewoduzebim.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/74107047861.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/66485105510.pdf
    • https://listocrm.com/userfiles/files/lujimafosisiv.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/bolexipikovitefijuwoga.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/11846049758.pdf
    • http://svsteinfurth.de/radsportfiles/file/bofatekajomi.pdf
    • https://rafaellopezehijo.com/upload/files/25875903861.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0d691b604---vamomo.pdf
    • http://rajskiewakacje.pl/userfiles/file/66144389110.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/32752500251.pdf
    • http://lionsmarsala.it/userfiles/files/67936311996.pdf
    • http://cy2hand.com/userfiles/tinipebe.pdf
    • https://karapinler.com/calisma2/files/uploads/gekapemobad.pdf
    • http://newkontakt.ru/userfiles/images/file/92268887972.pdf
    • http://hanyangsteel.com/files/fckeditor/file/18409733661342caa6121e.pdf
    • https://buyafranchise.org/files/files/vonilemugawiwog.pdf
    • https://jeanmarcrobion.fr/userfiles/file/roviwabotuna.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_off0000b5db.bin
34f099a9c714ea6919637e0b8923271f2dda7dead74e4e30424fd22e6248f8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DB 10404 bytes
font_01_sfnt_off0000cd86.bin
856e1807fe2c1177d39d1ad3ab395abb3fa36f416b1053c0879f5f4abf188da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 15688 bytes
font_02_sfnt_off0000f538.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 16792 bytes

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