Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa67721faf93d2fb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 10:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 733cacea11d55f4d80b265386d329641 SHA-1: 6e7873e9557f8c2f163406f3e062cca3b6ec4708 SHA-256: fa67721faf93d2fbb8e9316746e686e198b3d28b3dfa32881946ce4d5a226693
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 domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or spam distribution. 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-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://shopexpert.com/app/webroot/files/userfiles/files/fadozu.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/1702467282.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/90534468082.pdfIn PDF document text
    • http://salt17.com/userfiles/files/27819454481.pdfIn PDF document text
    • https://jensbrode.de/files/file/ropenojugizetakuwa.pdfIn PDF document text
    • http://dajia1.com/upfiles/editor/files/vemexizikixogewifu.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/tovesuwirujapite.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/mudopaxikiwata.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/1743197870.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/68854612313.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/79499635191.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/94310072146.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/6042413538.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7ef52bff---kurodudorazibutojera.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/ruzudabonatojo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/34038002913.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/43527926815.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/febopugenowifemegagu.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/majanodikiwateluna.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/32903823218.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109021618451071.pdfIn PDF document text
    • http://metzlerranch.com/userimages/zaworoxarunodosexa.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a19eb612---makenaz.pdfIn PDF document text
    • http://gibisch.com/files/files/53156971530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=textra+sms+proPDF link annotation
    • 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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 18928 bytes
SHA-256: 08a3008eff73b42857021b8149c7fc24fe22f5335a3aedee2f75e1d3351f5d8a
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10236 bytes
SHA-256: 53eb791371c6db2df39b59518737a124211f23e36c77055673c3910ac2d5fcbd