Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e81702c25e8463c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 18:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 090cc00834ba9140c9fea51a40d5ab90 SHA-1: a11a94ec56e72e0e22b27b5cc8ae917ffd162c8c SHA-256: 3e81702c25e8463c7e10156e24464d9ea87fede7943201bc4cc7da02e8bf1e21
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript which is likely responsible for redirecting the user to external URLs. The PDF also functions as a link farm, with numerous embedded URLs pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://huntic.ru/uplcv?utm_term=drum+major+instinct+pdf PDF link annotation
    • https://jasmijnbloemengroen.nl/userfiles/file/71074541709.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gadijogorilu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pv88uoq3jgtavdlv586otff4q5/36119838670.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/palaj.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/sikugonevik.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904115502.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/gufalowojuz.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/1187087382.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/kotuvamelaxasega.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gijegixeva.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/29095350732.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/verevomobojisake.pdfIn PDF document text
    • http://hasyo.net/files/file/88757767668.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/rodanojumodoxokurekatabe.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/raxomozewamagos.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/93468722366.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/57754184829.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3ecd82bd---lanajukosafagipojuxeju.pdfIn PDF document text
    • http://thecuriosityshot.com/demawijizafoniv.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/radeg.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/19745985738.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.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_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 10832 bytes
SHA-256: 6650ef6b600f07a160146ec637757da477ec824a4b1927b197603649e7387488
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17456 bytes
SHA-256: d71463f867191361b96f41c712c1e0925aa2fbe682b45d71110f8fde13d2c9ac

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