Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b8be959528bc57…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 13:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61686f63bb09e652fc4de06edad5c47b SHA-1: a76b2f429f5bfd0937af27cb1e2ac673deb4d045 SHA-256: 92b8be959528bc57a90e87817bcb98509b428bedb7032fc5866a017748fcae1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm designed to redirect users. The PDF structure and embedded content suggest it is used as a lure, likely for phishing or to download further malicious content, aligning with the Spearphishing Attachment technique.

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 http://casavacanzesanvito.eu/userfiles/files/86989188784.pdf
    • http://hagithanh.hagigroup.work/data/media/files/65344750011.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/53281379886.pdf
    • http://amirafouad.com/uploaded_files/file/30780076412.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/62247707434.pdf
    • https://heart-calligraphy.com/uploads/files/202109070300306019.pdf
    • http://form4concrete.ru/pics/cont/file/rugiloriwekuruxu.pdf
    • https://dolupin.com/calisma2/files/uploads/dorolerige.pdf
    • http://ablerexthailand.com/userfiles/files/47937652205.pdf
    • http://geo-equipe.it/userfiles/files/jepamusenivodupip.pdf
    • http://poultech.net/d/files/tosekizi.pdf
    • https://eurosan.pl/user_images/file/paxopagejidutekawodijo.pdf
    • https://ibextrail.com/editor-images/kevowarozawetatobo.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/43164555832.pdf
    • http://szmchem.com/userfiles/file/pemojebejube.pdf
    • http://irodaszer.lukinserv.hu/file/mavalozagufejamorebej.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/kizufemubo.pdf
    • https://fallsplat.se/bildbank/file/4399785906.pdf
    • https://hgindustrial.eu/userfiles/files/pororamevazonoroka.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4364e9909b72d8cdd7581a32f7befbd7/jabafatexogovopagalowojoj.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/gusozilofomudu.pdf
    • http://www.sudaff.com/pics/file/66909317642.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/76832203414.pdf
    • https://hoangnhataudio.vn/media/files/93530080366.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=manual+transmission+service
    • 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_off0000ecc0.bin
c1313cab300d7bec21375c5136b2ebdf3eeda512f627e45ae5adebede516555c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 18136 bytes
font_01_sfnt_off00011b68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 16792 bytes
font_02_sfnt_off0001337f.bin
23ae55cba4027ce8cc56b64e692d8592625a14c408132bcaeb1f431a8702b30f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 10552 bytes

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