Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1072e506c51172c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 21:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 17cb3236eb77490e7ec9e42771b44fd5 SHA-1: 2e6b147668bff75ba73b175ffeddef0902f1ac09 SHA-256: c1072e506c51172cf1f8e0dac492566d57769de5baebebabd9ba705356ef6dd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=bluewave+tablet+hard+reset PDF link annotation
    • http://falconltd.pl/cache/file/9641030667.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109201550135648.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/94309437179.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/75205224951.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/94445984337.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/56539331802.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/pibes.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0919/aeac46c56aab0a9e07cab6f6d3f0a734.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/11053761298.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/61884571892.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d15209653---tafebefozoduvujusetunog.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/84017373562.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/8319582863.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/venurorotaxudol.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/movakami.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kunozosalolatezikokiga.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/nuvewozuro.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/48268457124.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/39132760210.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/kenifajodanodafefo.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210904205409.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10472 bytes
SHA-256: 4ab0c53df3416bb3243049a143736315b82cf75cc098231a5f9678870f54fa59
font_01_sfnt_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16452 bytes
SHA-256: aa196f0710ac748ea1e6018ce59fff3a8b6ebcb58bebbeae5ddee68028b0f3a6
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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