Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d07b07de7356bed…

MALICIOUS

PDF

73.7 KB Created: 2021-09-10 17:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cefaad39dcd30b4087d62ff1cdd58059 SHA-1: 8842c9f1cc4ec43c8fdf1920dac1caea7eadfffc SHA-256: 0d07b07de7356bed9e4d4af545672e05c93f93f4cba4d1582fb9192f38b01d37
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=rokkr+tv+bundle PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161341a0c46ec0---jalovubinonogubuzotamali.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/1418469081.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lavuf.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/14969706076.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/43uj39rv8povgd7sl1cvs7un4u/53708347338.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/6123668808.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/nunom.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/kabifagexujunubojero.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/46376054418.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/12490559426.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/30309841438.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/20176294432.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/gojapufefivabilaxomej.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/21968453136.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/68555391978.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/92794158163.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/28512465092.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/67947443864.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gugopanaxasibudaxu.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/54587298950.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/rotawowojidiwofikiwixul.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_off0000bdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 10264 bytes
SHA-256: 5302c6c828f9aa8ff6ed29b0a195914851f58b487e8e25310cfc018a214c734a
font_02_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 17196 bytes
SHA-256: cfa3fba8796d2d736d770a5db81fb3d78991541bafb88a208a3d6c1389be97d7

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