Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cddfa042d6cb13…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 05:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0745d5a69cc77b3bf18ced850c8f6af8 SHA-1: c1b402fa59367d68f9024c14a195e3a3d4f555e0 SHA-256: 45cddfa042d6cb137fb563b0101b697097181edc70ea9b98b7d1fc3c4021f0ca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://warungmimpishio.com/contents/files/51532453188.pdf In PDF document text
    • http://mcap.cz/images/uploadedimages/file/lovigepusijutufez.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/wesozojogidunizoke.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/desegolidokezo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/88777194165.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/89218831347.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630787323_1.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/tetizubakejotaxo.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/73806321050.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/35744898494.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/newetigifufi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138542b8c8e6---70626431343.pdfIn PDF document text
    • https://istanajp2.com/contents/files/16681888208.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/sifamuzusaxit.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tofef.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/lijaxuzanawoguvolob.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/85993651799.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/girosuvigojutajufudozi.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sobubopitowekegu.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xekedobekusazujizedu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/96203524322.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_4CC6DF1F82A1D078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=crash+chrome+androidPDF 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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 10524 bytes
SHA-256: a33f055b6cb108bdfaffe55e0d2a719874a1720a959f8ded0249908589fe3236
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 17152 bytes
SHA-256: 1bc8866f682f5d35b94d5a60a471660c39ae27a3f6275d3cf100fc4e54e669f0
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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