Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2780c37a676066b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 21:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d23df54ec1e3ae20a5d3d1d4e96ba3 SHA-1: 9dab0914d7cee9e7437a84e5dd476a690dd04a5e SHA-256: d2780c37a676066b2523f7975da586c4fd9faec3ec4ff9f73f6428b696b67cff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hiroyoung.com/data/files/25536477954.pdf
    • https://aglogistics-bo.net/userfiles/file/nedefed.pdf
    • https://acgroupenterprise.com/userfiles/file/bevegipukezureturasokuk.pdf
    • https://szabobuszberles.hu/files/files/22669197794.pdf
    • http://borik.customreal.sk/data/files/rugigumapifi.pdf
    • http://worldwidestationeryholdings.com/files/file/sewinejilujemejimuze.pdf
    • http://denkobarbell.com/_upload/files/91629394384.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/78321366272.pdf
    • https://speculatio.in/ci/userfiles/files/jagiwekapepejebirozud.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85108b98d---jodoxufipat.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/6365765376.pdf
    • http://twapp.freshkon.com/upload/files/bibag.pdf
    • http://brmhn.com/userfiles/file/20210908215746_ha26s2.pdf
    • http://dragoniresorts.com/userfiles/38566051226.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/64899508798.pdf
    • http://ckud.handysociality.com/upload/files/xatodunusibi.pdf
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemitopulimuxerov.pdf
    • https://daqing-jewelry.com/uploads/files/202109161150554590.pdf
    • http://beerskiboot.com/img/upload/file/pudolakifeburigan.pdf
    • http://smingames.com/ckfinder/files/kujigagoraregakabinape.pdf
    • http://ikuma-car.com/js/upload/files/94654492939.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/xenuderozunolo.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/09/gepafewijusin.pdf
    • http://esipro.fr/userfiles/file/bideta.pdf
    • https://magerp.org/upload/files/68954239123.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ethos+pathos+logos+in+i+have+a+dream+speech
    • 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_off0000d3f8.bin
50f8139d1105c1f085e4ce620538151d6c6af5c887d8285e1402f3c2acb57fb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 11008 bytes
font_01_sfnt_off0000ed3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
font_02_sfnt_off0001054c.bin
31b1fe657a6c263b1901424f2df871026b892eae55066bd0b1a6f9a5a63a830f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 17320 bytes

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