Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bafcb55ef9b010c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f66bb814c6a4b2660cd0c8217ee32d3 SHA-1: f3904043b5bb37bde16957cb744a45ad0081e4fa SHA-256: 7bafcb55ef9b010cfa03911d584f7ed071dc2c8b29bb9aa5830eecb019f00738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://ajwatravel.com/wheelmarine/userfiles/file/fuwonor.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/xanigerotegigali.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tebatafitawivarukasuz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d1c681fd---muxenofadedenipekif.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/pinoderexugizexinij.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c45a7a741---24931381991.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/konozarezukime.pdfIn PDF document text
    • http://innotack.com/userfiles/files/27519431041.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73608782973.pdfIn PDF document text
    • http://bienbao.net/uploads/files/duwozulalidumewexe.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/27490227332.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/9152351645.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/botokolatamiriwu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/50984037054.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bamolazovojofulumeb.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/sewovotevopilobesinaxi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mitafipevuleramojikutilur.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/dolakilovebi.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/58366696065.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/95866904701.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/10442039789.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/vemigesevopatoxugijeliral.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pasufutenubaxuxemefi.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/82349856085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+connect+phone+as+camera+to+pcPDF 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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10576 bytes
SHA-256: a9f1be83369b542490932273685f3397ad75ae8c92dba301bdcda0f8c5743fa5
font_02_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 17940 bytes
SHA-256: 47277ed05e336484a4a8c25740d4a410952424380a94c08d5bc5668aff848b88