Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8fab8c44b26e08…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 22:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baaed58eb09e5bfc618fe4fe9bbf06d0 SHA-1: f9b1265c1a94484302089c871082c84200802f30 SHA-256: ed8fab8c44b26e08404efe31584264193eef6cef9712c5c815681a492d9d8324
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 a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=reels+auto+liker+free PDF link annotation
    • http://thebankcardservice.com/uploads/files/nezukobubataboxekaperug.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1ddb4d1c124fcfe36c108c3d17f3a442/gabilarurupotepariwazaf.pdfIn PDF document text
    • http://dakov.hu/_user/file/sunedalipamose.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/88598228765.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/45215023900.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vepute.pdfIn PDF document text
    • http://actinq.nl/upload/file/patoxopemanasat.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/87630936391.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/gifimajeloxafu.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/rogadupepalurov.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/37340684935.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/29406389204.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/43232660775.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fafuregonawigit.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/xamasoro.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/bifolivup.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jupudigupagufuvasetim.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/38069030138.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/87883503731.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/menekokajodiziweba.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/3682213008.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/ruvumivazoxi.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/kewexem.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/10473482506.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/widosowurezaduwunakil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16592 bytes
SHA-256: d172ea01722d6231131fe4eac457ba9dc9651f825710a9b51e230f1155f136cf
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10340 bytes
SHA-256: d3389c2950cfec974016f4633d7496d13a5080b8b8c20a8892e085b619f0d9db
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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