Malicious PDF — malware analysis report

Static analysis result for SHA-256 95847bf91e1a59c3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 13:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7781409174a33a046d00834e00ca46d SHA-1: 035009e35369bbddeeca0cd1d368e6ae5bda90e7 SHA-256: 95847bf91e1a59c3d6b1c22692138b35b239410d7f3ba775cc735c97bef38888
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mk-promotions.com/ckfinder/userfiles/files/fakeva.pdf In PDF document text
    • https://reha.bg/content/upload/file/98144284777.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/begajilidudu.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109052300387682.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed836787cb---nopidulogubo.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tapezokogusulo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/gipikusekenefa.pdfIn PDF document text
    • http://roocenter.ru/upload/file/66046181974.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/97620283473.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/68884533110.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/damitiwifobikiz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613501ea85853---77325768089.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/34525855679.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914075337.pdfIn PDF document text
    • http://pmke.cz/pictures/files/komuba.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/wifodefos.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/kanaro.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/kivulogodoluxepetosulu.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/wifegavakejabekutufoge.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/puwemuna.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/7857390559.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wasifupomajojagerixoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=transfer+files+from+iphone+to+pc+bluetoothPDF 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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 10948 bytes
SHA-256: 23bece05e7ed7f6baa8a3d0ad8452c3d06e40514b7aa707b5a5d6b0a6077e78d
font_01_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 17688 bytes
SHA-256: 7e25e4b58601114a70034e3dcb6fd58b994a00588cafabf4b2dc4d1aa70e9b60

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