Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78048c75c106b84…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 23:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d672443b40eaf81b7ca8893c6c6e3a6a SHA-1: 958b66dfa47308166a83d9fec486d2c564ffd091 SHA-256: f78048c75c106b848415574573e1daf380dac2c112000f3f66aae323b03cd4b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a link farm or phishing campaign designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://metalltechnik-kutschi.at/zozikevukotovoma.pdf
    • http://benthanhsgfarm.net/images/uploads/files/jotawosoguzez.pdf
    • https://iohrp.org/f_files/files/dovesexituroniwolewekamu.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fidujemovaripobuximis.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/95361746863.pdf
    • http://farmaciafoglia.eu/userfiles/files/3315695640.pdf
    • http://torgoborud.org/images/file/daxokofof.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ac16e078---jozokaxasowifak.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/57521532843.pdf
    • http://savvyais.com/userfiles/file/vukogisepikevuvaf.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/pogawubomela.pdf
    • http://taxfreepoint.com/file/fumarakabej.pdf
    • https://bruceautoservice.com/files/file/nanuxotefisorovepipokik.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56087195869.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimij.pdf
    • https://ebal.ro/app/webroot/files/userfiles/files/gidasarebifezag.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/41588299180.pdf
    • https://remini.hu/userfiles/file/91449201996.pdf
    • http://alituncer.net/userfiles/file/73774606488.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/79847484294.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/12257224267.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xupirovitiveruwefes.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=friends+the+one+with+two+parties+full+episode
    • 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_off0000e8df.bin
999576ea386eae540b4779ce5d50020d8e5544341a5abaaf9c548a9fc0cd537e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 10760 bytes
font_01_sfnt_off00010190.bin
a56827268673f4dc86a43090f2409f5cb22367a9d3636c453c355cef679ba94a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 17604 bytes
font_02_sfnt_off00012f0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0A 16792 bytes

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