Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72cf84bf2367968…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 18:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 722e32f7422262e965674873b7b70b17 SHA-1: c1367997adf8cfb49150c1afb83eb9ff955e40f4 SHA-256: e72cf84bf236796893a32510c603a211a1e5916d8d87a9f0faab77bca3578521
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via the numerous external URLs.

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613635cc29186---kukik.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/46208203595.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/75617117382.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/sanugipidemira.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/15825463684.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/57849654110.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/wobovanajusewijoba.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/61261994866.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/3682984124.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/divetepefajinamerudorugi.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nokivimodovefinelon.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/jelewuxivawabuj.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nizewodidufunituweraf.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/siripodujujote.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/bubunajawawupubomojenag.pdfIn PDF document text
    • http://adice-area.com/pictures/files/xudejuda.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/vumojajezixeruxuk.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/giromobe.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/4085058578.pdfIn PDF document text
    • https://themalc.org/files/file/potoleve.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vuzewu.pdfIn PDF document text
    • https://denimder.org/resimler/files/sedabujolita.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/dalofafekot.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/72513020376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=boruto+episode+watch+onlinePDF 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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 15292 bytes
SHA-256: efdb4179df883be365e608dcda2580fed29a796ad8bc0daf3e613812aeaf7587
font_02_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 10852 bytes
SHA-256: bfb5fea2f1267d2d84984f4ddf0bd227e016975d060968f559190a3b78a09275