Malicious PDF — malware analysis report

Static analysis result for SHA-256 4281af2425f2507c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 16:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e7ff1c2fa8088162f20e426ee978ba2 SHA-1: 413ccd2c82751f553d55325c22aef523aba67f3b SHA-256: 4281af2425f2507ccbf40872c425c6d768c27f28680b18baa943ad1ab29d37b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://inwebjor.ru/uplcv?utm_term=create+spinner+programmatically+android
    • https://pianoinprimopianofestival.com/uploads/file/xoxenasogo.pdf
    • http://hanifeugur.com/image/files/63562525491.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/36427068213.pdf
    • http://thekitchendesignstudio.org/uploads/files/22724798760.pdf
    • http://gazosilikatnn.ru/uploads/files/21534212920.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/89599266333.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7b096kutk5fmret60kb3fmsu04/wewowogupolim.pdf
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/89032948612.pdf
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdf
    • http://darangyi.com/userData/board/file/68271414213.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/72909665239.pdf
    • https://birgatour.mn/js/ckfinder/userfiles/files/rajowupovefafikujox.pdf
    • https://alrukn.co/userfiles/files/48313098573.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/jopigavudoreroketidew.pdf
    • http://vervesimuhub.com/userfiles/file/zexejujeri.pdf
    • http://soles2walk.com/data/file/ninetojazifim.pdf
    • http://boki.hu/editor_up/mobokokivupituleti.pdf
    • https://vmwarts.com/ecovic/file/tekemabama.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/mikepixidafefovikomiwo.pdf
    • http://ciar.vn/uploads/image/files/geforoluzivep.pdf
    • http://arunimaflavours.com/userfiles/file/lagujonuri.pdf
    • https://kawanmto.info/contents/files/ponapiv.pdf
    • http://qwerty.pl/_data/file/14620314947.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/finisojarafoxawakuzi.pdf
    • http://ac-kenigsberg.ru/files/file/xuribif.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43bd27312---47806418213.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_off0000d630.bin
7de11941bf2ff5547a616811c801f84890eceb053539fb17f7f21976c8491c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 19372 bytes
font_01_sfnt_off0001085e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
font_02_sfnt_off00012075.bin
452d622e2af9eec41435b19431c9928c20e7c3a9741d387592b1d43fbf8bbcf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 11004 bytes

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