Malicious PDF — malware analysis report

Static analysis result for SHA-256 3162b2f1d151ff01…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 04:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac0f7d04d6769bebde83553c3eed3b5d SHA-1: ab46b9d6e9daa80267235ecb3733da533c45d335 SHA-256: 3162b2f1d151ff01df97633632a0a60b3ab7b35bfc107d8ca829d599a986152e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute code. The PDF also includes numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript points to the T1059.007 (JavaScript) technique, and the overall nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://threadworx.com/thread/admin/uploads/file/38025852238.pdf In PDF document text
    • http://jamesandsons.ca/userfiles/file/1669569598.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jizamepaniva.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613708d126b36---duzolekawupeledu.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/7563187576.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/reridopig.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/lidivoxisozufuwere.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/76723133207.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/lupekefeseveruboki.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/6874803982.pdfIn PDF document text
    • http://vucert.vn/uploads/files/91513042387.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukubopukenepekunefiba.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/34734183662.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/34740789368.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/sazexur.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/ligadubifa.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bijup.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vowazaxurowiza.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/57671917588.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/mogojadij.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/ladoweziji.pdfIn PDF document text
    • https://vpmemorial.net/images/file/burepujaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=billiard+city+mod+apkPDF 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_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 10528 bytes
SHA-256: f2c4267bf73da9d685de349feb8a2f5aec062b48f704e01ea6d2042a1c042e88
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 19328 bytes
SHA-256: d0f2719da3f6a407b24054c9bf4074c927c6e47de619d6097413b714d2068503

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