Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1cedbf1b672a6e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 14:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4be4530c067ec4a1b2aeccfdb622002 SHA-1: f729f2aba567bad6a60256bb7489ef2b3b626d2a SHA-256: ad1cedbf1b672a6efd0fe807358a2f1972d03c6eb9aeca36da1a10b977b8bef0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers 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 content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://iburgisidimarsala.eu/userfiles/files/fubakelikotesisi.pdf
    • https://groupburuemas2.com/contents/files/55735579599.pdf
    • https://mygrind.ie/userfiles/file/78101203391.pdf
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdf
    • http://leaguengn.com/userfiles/file///59153168503.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24683281565.pdf
    • https://concurs-euclid.ro/upload/fck/57139494887.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/bokusexudutamizukaxojivo.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b3a170ca---45877255851.pdf
    • http://kxqcgs.net/filespath/files/20210907173537.pdf
    • http://morecoredesign.com/images/imageUps/files/19918097158.pdf
    • http://dralituncer.net/userfiles/file/dobuwasusenanelunaganolu.pdf
    • https://t2sc.me/userfiles/xajedepasositogazigadadu.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/1257545497.pdf
    • https://dampinggame.com/calisma2/files/uploads/9296846251.pdf
    • http://nitexprofi.cz/userfiles/file/ruxozazixivuto.pdf
    • http://zatuchlina.cz/upload/file/nowofixoxesame.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/33651832483.pdf
    • http://kemenyseprosiklos.hu/upload/file/45160008854.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/74781661816.pdf
    • http://baovethanglongmb.com/upload/files/wuvelufa.pdf
    • http://ping-property.com/user_img/files/novodumivanebosapifaz.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5129d1371---82588548447.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/josasoturedesisetev.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=iso+10006+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_off0000b9c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C1 16792 bytes
font_01_sfnt_off0000d1d3.bin
c7a705f344b85cec58fb3c59b9bb78ddd15e9e25e325f5c4eda89d5b02a935d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 16128 bytes
font_02_sfnt_off0000fb2e.bin
62546eec7e13c4664561284e3fc62d8a562d55af4d56f9e74f4af5072a4a2506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10048 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.