Malicious PDF — malware analysis report

Static analysis result for SHA-256 e124643bb8f0adda…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 12:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c428f874eb0629fd449b8b0af7161db3 SHA-1: b1b4d4d444b28e25ec1ca63dc955771d7f61d914 SHA-256: e124643bb8f0adda731b9d42df436d78d686f46cb2f04b44eddfc41999c9db53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document as a link farm on disposable hosting, suggesting it's designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://toeicspeaking.net/_UploadFile/Images/file/filavemunevoxejota.pdf
    • https://fallsplat.se/bildbank/file/60364469880.pdf
    • http://bluebossa.pl/files/file/zelidi.pdf
    • https://ccichn.vn/data/upload/file/ritirefeseresiderebar.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb0931bb1---93331243358.pdf
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdf
    • https://systematix.pl/userfiles/file/17814883271.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/lefefejekobipowarovuriv.pdf
    • http://gruppocaminiti.it/userfiles/files/84672414643.pdf
    • http://otohyundaidanang.com/uploads/image/files/fowofowutorob.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sozemimogazovigobogo.pdf
    • https://szallas-karpatalja.hu/upload/95841225433.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/pabalokekoxajuj.pdf
    • http://guowangcable.com/d/files/wegomerik.pdf
    • https://esprimagroup.com/userfiles/file/79978861773.pdf
    • https://12waktu.com/contents/files/4052176680.pdf
    • http://yacpa.org/yacpafiles/file/bovavinuvorejigoja.pdf
    • http://bischofs-scheune.de/userfiles/file/xupekur.pdf
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39566214796.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/51089371874.pdf
    • https://sicurezzaips.it/uploads/file/femarezu.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/57793235554.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371d21b98f5---gafidun.pdf
    • http://ajej.pretty-match.com/upload/files/wutave.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77140405516.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cts+verifier+download
    • 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_off0000e12d.bin
2b2bafd4f66ebea7fc73f36b261fd8025a24bf06fa1e0ef79fcecd9e9f45d97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 10532 bytes
font_01_sfnt_off0000f960.bin
ef221a4b8bded7bad1c9423dd45abefee899f9419cd1bc3b5a633c5d6564b394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 17444 bytes
font_02_sfnt_off00012729.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12729 16792 bytes

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