Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c30a6a93c21b3bd…

MALICIOUS

PDF

93.9 KB Created: 2021-09-22 19:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff71d26fb9066e86a795c0f97f7f4a60 SHA-1: 26163ab2d49ef04a65f9fd9a0a70a94796b9f003 SHA-256: 9c30a6a93c21b3bdd1249a77c4d8690af1fc64af1e0be91e5f04d44f71687cda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://copy2d.com/ftp/image/file/31185775200.pdf In PDF document text
    • http://tabletopad.com/images/file/41753387958.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c849c3242c---94485424423.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zoxuzamu.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/50210726037.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/dixopukagapadonetufukeda.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/66389359938.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/50761295491.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/sufoxifugusibirisula.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/5210485036.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/9645342857.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/80664102659.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/vikeridosasixifufigu.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/polisi.pdfIn PDF document text
    • http://talleresjpg.es/img/file/61794656192.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/motewujuvixaz.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/zixamubozekafej.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/jareparazagojixajenalonig.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwalejivadidiwu.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/jofaxikinowujij.pdfIn PDF document text
    • http://aven.su/userfiles/file/girusigaturimerifujeru.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/bamogomazosulexoxorabome.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/wevidamizutukadosil.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/85428698866.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210912_2BBD190171250AC2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mi+10t+lite+led+notificationPDF 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_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 19068 bytes
SHA-256: 27ddcc082c1b17cb51e3e5643c94cfdcbe34b3a63582cfd0b4deed980fa17788
font_01_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 10368 bytes
SHA-256: f9767cee13883f40bcad35772e5a9fff97402be887e8f7ed9b338ad8182a6722