Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c375eda0224de89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 03:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c76597dc8dc8c49414c06ac14c6abfd2 SHA-1: a25c41093597e96ec90af6f0c0e058ac97d6ba9a SHA-256: 6c375eda0224de89091abbcde9aad207d970e7d3dbb7aa33ae4af755b62f91af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that act as link farms, redirecting users through multiple domains before potentially reaching a malicious site. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or redirection attack.

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 https://crysiq.ru/uplcv?utm_term=paw+patrol+star+wars
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/jurakemuvu.pdf
    • https://eetravel.net/file/xomexuzotudi.pdf
    • https://detmers-kontejner.hr/files/mutusegedipafiw.pdf
    • http://studiopiergentili.it/userfiles/files/nopopi.pdf
    • https://sukienmiennam.com/userupload/files/20516819737.pdf
    • http://www.css-jp.com/upfile/files/2021/09/11/56702862460.pdf
    • https://namkhoasaigon.vn/web/images/files/bigixeniwobegomo.pdf
    • http://abw10thstreetne.com/uploads/files/76919531600.pdf
    • https://meganimal.pt/site/upload/file/jimafufadoge.pdf
    • https://superchills.com/userfiles/file/48625601748.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/10100072110.pdf
    • https://landtop.com/filespath/files/20210908230930.pdf
    • https://bandotrading.com/uploads/file/wutanadokomumadu.pdf
    • http://gomsuhoangminh.com/app/webroot/uploads/files/95406067767.pdf
    • https://listapp.in/ci/userfiles/files/15268750235.pdf
    • https://radmangroup-ye.com/rgfiles/file/86797671135.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/36642524775.pdf
    • http://terminsk.by/pics/files/davamugoxejeluporevuwem.pdf
    • http://longchimvac.net/app/webroot/uploads/files/degizewajusanedosonowefap.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/guxafanufabukefubeki.pdf
    • https://plagij.at/ckfinder/userfiles/files/82258357787.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/89763015215.pdf
    • http://ramenzoni.eu/userfiles/files/60684515895.pdf
    • https://hanyauntuktesting.com/contents/files/xekajikowodota.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/6950151663.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_off0000db4d.bin
311f89a4b464d02f7008c45a7ea4f43cd51d741cd8415a7db1a68c3bd0508eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 18432 bytes
font_01_sfnt_off00010acf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16792 bytes
font_02_sfnt_off000122e6.bin
f0e940483d3e7aaffacdb922091e2d93e83dec71e2a181ca376d518284973eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E6 10004 bytes

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