Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aafe58a0b02e7c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 10:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f09734d1de8395b681b611f14df073c SHA-1: 9363dbc5a31977a865f680aedd341e5524d93f27 SHA-256: 85aafe58a0b02e7c5ce273ff96d5d9654e26d608147da1058a3b4862ba37dd1f
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 part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130487912149---32925080860.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/54618701606.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/42999388321.pdf
    • http://intertexmedical.com/userfiles/files/27335630519.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/34787295341.pdf
    • http://studioesflores.pl/obrazy/file/baxamibuf.pdf
    • http://garantc.ru/userfiles/file/fivevokujegoleza.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/26902854445.pdf
    • http://csc0535.com/userfiles/file/20210917042006_jw2cgu.pdf
    • http://dinobajka.pl/Upload/file/getefajipox.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/50474085031.pdf
    • http://kastely-vacduka.hu/fileok/file/53731332337.pdf
    • http://0048.pl/48files/file/15119443355.pdf
    • https://cauthinh.com/luutru/files/41248130508.pdf
    • http://zerosquareonline.com/file/23639728494.pdf
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/wubibederose.pdf
    • https://vili-al.com/uploads/wysiwyg/files/91497724543.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021091807450973499.pdf
    • https://theipbuzz.com/images/file/21267177361.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vakumuxulotekoju.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xefomif.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210914_101402_141.pdf
    • http://klemanpince.hu/files/file/gevizoti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=is+there+a+way+on+instagram+to+see+who+views+your+profile
    • 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_off0000b5b0.bin
8f77b4ecdd5cb15bbfc7a2cea909fe0d8d0d98eb346b880a907f76a45f6e7b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B0 17448 bytes
font_01_sfnt_off0000e1d1.bin
25ad7d5b60045775ae8c4f1c1800c9d1bda5c862355dd6eee2a16eb6ca3f2b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 11120 bytes
font_02_sfnt_off0000fbb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 16792 bytes

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