Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03139c7adf63f41…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 07:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d2f5f0793a5694dbc4e43ad0ce8fb79 SHA-1: e54b41abb91f7e45bc043a8d537f453de5e59202 SHA-256: f03139c7adf63f41261efb6bf0bb68939b725d60240852f44c7301280ffb0360
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=super+mario+run+unblocked PDF link annotation
    • https://olamare.com/img/uploaded/file/muzumolomolumakimunodoge.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/51878007443.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/datuwebexariridiwis.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/19504715152.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/daledosazenelivefozuxaf.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210906161918.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614411313f1b1---sereroku.pdfIn PDF document text
    • https://keongracun.org/contents/files/53963314728.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/95336194215.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/sarawitubiloroxekasi.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/kuwimasedeg.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/69873321926.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/femojutuw.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/74990164816.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/tisipek.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/venidiwakinefumufumubixug.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/ridazewasip.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/kupun.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614376da264d7---21223885305.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/91658614961.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/welapar.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/20704026794.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 18400 bytes
SHA-256: 5e9c348d21c89221c30ac588d6b721a42dc8106f6dd5dc0e0782893809614f92
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10816 bytes
SHA-256: 7527b21a694e810535a4cf99552b10334d2a84991f3c48dbf1948c9677a03852
font_02_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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