Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4776bde9bd8008…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 02:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c655eb98cf7fa1efbf06562ddf64ab0 SHA-1: 7faa27138972521c63cb733b079465ec0def2ef9 SHA-256: ae4776bde9bd80083f5c3008c0cd1f1d9ce0f01a2b8d7acecced0a1de53d016c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of many distinct hosts and a high number of links per host suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d555fa1ed56c31632d816c13ccf203e/bosexowijonu.pdf
    • http://cn-polylysine.com/d/files/43501380442.pdf
    • http://murito.fr/ckfinder/userfiles/files/niwiliva.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54babe840---10948103619.pdf
    • http://envigest.cz/upload/file/24820527001.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/sakunepijisek.pdf
    • http://escritacontabilidade.net/fotos/news/file/31840614726.pdf
    • https://thietbidiensino.vn/media/ftp/file/96799865608.pdf
    • http://azizolace.cz/images/file/7207916748.pdf
    • http://s2group.pl/userfiles/file/47411203024.pdf
    • https://bevillelecomte.com/ckfinder/userfiles/files/46188472583.pdf
    • http://avvocato-callegaro.it/public/file/dopadefepepobajovimu.pdf
    • https://giorgiosantinelli.it/file/81075869362.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/9054931329.pdf
    • http://www.firengo.com/userfiles/files/tunebetipipewiwofalo.pdf
    • https://eminenceconstruction.ca/viking1/uploads/files/tadofazelifomezomavejes.pdf
    • http://sieuthibds.net/images/files/55202675039.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/84600541734.pdf
    • http://consulcongress.it/uploads/assets/file/semuvojowizinoleko.pdf
    • http://tourister.kr/userfiles/file/sulazipoge.pdf
    • http://abwessex.com/uploads/files/77922746583.pdf
    • https://beauti-full.ru/uploads/files/majuziramonuzoli.pdf
    • http://www.urbanwaterways.info/files/folapulimejawozezo.pdf
    • https://kamionosnyelvlecke.hu/userfiles/file/92941117388.pdf
    • http://nfraccon.org/userfiles/file/44088689794.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=david+bowie+serious+moonlight+tour
    • https://b2cdemo.tickets.com/content/files/47059562653.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_off0000b1df.bin
395d8b755ec10d75a37bc43ddb61b58ab6785014665103ab9eb35bd118dfd8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 15964 bytes
font_01_sfnt_off0000da4c.bin
3d2f073ed526e6667c89c95739c5c99592710cfb5d613436f3a2ee66d561622b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 11088 bytes
font_02_sfnt_off0000f3cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes

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