Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c357386abb938e1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 00:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b7d00081ad5c14fe11256847d976a24 SHA-1: e5238e549ac20072b552c17185e9bd2edc83b717 SHA-256: 0c357386abb938e1cd382f972ec8b3db890500415816950c6c6aa182f57b950d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a malicious phishing trojan by ClamAV. It also exhibits characteristics of a link farm, with numerous external URIs pointing to other PDF files hosted on potentially disposable domains. The embedded JavaScript likely facilitates the redirection to these external resources.

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 http://webinaris.net/ckfinder/userfiles/publics/files/7740865450.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/54628541641.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/74187024890.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/dowenofifefiwalosuji.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/9025146601.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/22164632812.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092102492940.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff8e9f4fb---5807057798.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/funemudi.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/patodekexenarativ.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67575691534.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/12156258701.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/12275649570.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/98203539997.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xufofadaraxuvotegowegasak.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/bulilusa.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/43447742764.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/lukujedalu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/73219248358.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/fijivipusep.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/pivolunori.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/77673583516.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/musorabaxewaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=partial+derivative+chain+rule+calculatorPDF 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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 16616 bytes
SHA-256: 0e5460969e849a4c52d28b5972a8089a5b9f4d377c375e36ccaf8b05ed40cf7d
font_01_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10468 bytes
SHA-256: 893899904b803df414945bda9daf44356e4c67c221a0d4aae662e60ef52b0434
font_02_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1