Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7f43286c44e942…

MALICIOUS

PDF

114.1 KB Created: 2021-09-18 19:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8bea35aecec2a75d2a07dddfc0333ac SHA-1: 8400e82a19c82a6b779ecb137b5b35d8dd0852b9 SHA-256: 4a7f43286c44e9422bf6efe2a509ba03290744c0203075b937ba25f17c72494d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://2b3la571ga-70p.com/contents/files/sukojewatapegazafuv.pdf
    • http://rheinmotel.com/userfiles/file/rokaberedepeva.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34850434091.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/fosagisa.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/72101788675.pdf
    • http://nghieuphong.com/upload/files/gepuxamowurilipexiris.pdf
    • http://topstec.com/d/files/59850863126.pdf
    • https://efsanepin.com/calisma2/files/uploads/88895706794.pdf
    • http://rutka.pl/media/upload/files/0fed9f576314c8886be017c2b654b571.pdf
    • http://rainternacional.com/userfiles/file/vusodawidizivotiv.pdf
    • http://ingegnasrl.com/userfiles/files/44735018697.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/6000979818.pdf
    • https://asken.as/bilder/file/34537155520.pdf
    • http://www.sauminandy.com/fckimages/file/53772962743.pdf
    • http://ablerexthailand.com/userfiles/files/62030560527.pdf
    • https://betamachinery.sa/other_files/File/kuzamajorekezobegoraku.pdf
    • http://inter-travel.hu/_user/file/zikuxeri.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/56304995872.pdf
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/22073672432.pdf
    • http://tuttotop.com/userfiles/files/gukat.pdf
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/94782446942.pdf
    • https://charteriraq.ir/basefile/charteriraqir/files/zatisigetodalug.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/zewikokub.pdf
    • http://satthachkhe.vn/image/file/52229944686.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bf0cdba80---jekaxevadebokejeviwid.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/runuriga.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=logan+wolverine+comics
    • 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_off000159f9.bin
d7bcfa3faa83e6ba7a0d83f29dd9617b35f82ec83b7aef05c1c0d9d352f2926d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159F9 18648 bytes
font_01_sfnt_off00018abf.bin
224092f175fb7490018eab99f1b66ea012840c6a606d2dfcc937b3914e85da1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABF 10584 bytes
font_02_sfnt_off0001a2ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2EA 16792 bytes

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