Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7509d5204fb0e5d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 06:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 957378a171f73310550ec5117cbda440 SHA-1: 3418ddf758f1165243881c9d521f3d7c6624be44 SHA-256: c7509d5204fb0e5de9696549c47546b9e87e0e2971e82c32d4375840b8ea1b66
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further compromise. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=phone+keeps+closing+apps+android
    • http://lidaoxc.com/upload/files/10356951496.pdf
    • https://beyondpins.com/calisma2/files/uploads/gupapusip.pdf
    • http://allgeology.ru/ckfinder/userfiles/files/fibazunax.pdf
    • https://hurghadalife.net/userfiles/files/vororoxagukikudibudejumu.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/87185606121.pdf
    • http://honeystraw.com/uploadfiles/file/58840366230.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/96508446518.pdf
    • https://nhanloc.net/userfiles/file/45936429327.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/wisetonililexapujeleturo.pdf
    • http://hzbmsj.com/images/upload/File/lonuxenomazavezexubi.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/70846892638.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912863bcac---92819136170.pdf
    • https://ibextrail.com/editor-images/wubebisosoge.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/13949032989.pdf
    • https://dobre-akce.cz/media/files/file/9924387640.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-9-20/20210920104438574442.pdf
    • http://sziazsauto.com/uploads/files/28527425482.pdf
    • http://qapoll.com/2015/vat/upload/files/gosuva.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/wefobomijifoduzoxikazo.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144f4b4ee45f---35070880414.pdf
    • http://sysquare.com/UserFiles/files/2954792600.pdf
    • http://toitureetfacade.fr/data/Files/puvisigi.pdf
    • https://dom-titan.rs/files/misugab.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_off0000af3d.bin
89ddf0757f186d02774c480afa4902c34f685b6fb72cb9b0ae276b975142df63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 16116 bytes
font_01_sfnt_off0000d860.bin
58f7020a88d1c5261a1f01fe7a685f7193159d424921aa6c8331da1f6ab04c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 10788 bytes
font_02_sfnt_off0000f0e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes

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