Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faf1ebf2bd654da…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 18:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5afc2c4c12e1f422337f39f49fd4c63 SHA-1: d3121a2268ade360d8f46ad9cec4a04408695f7f SHA-256: 8faf1ebf2bd654dae64cb19263c8d0438ae73a8e534fd88f26c7faf944397a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or redirecting to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. No scripts were extracted, but the presence of numerous URLs suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://leeandrewdavison.com/download/mefukugiruwob.pdf In PDF document text
    • http://licorne-hotel-restaurant.com/userfiles/file/pozaxenigixitemike.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/91076944187.pdfIn PDF document text
    • https://service-panev.com/userfiles/lofijoxenirozafuwimifew.pdfIn PDF document text
    • https://umutfm.com/resimler/files/35930775248.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/gizubeforirif.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/mezorofaxiwafo.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gelafogotikavapoxa.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/64897795968.pdfIn PDF document text
    • https://inarsindbari.org/uploads/kinomasatukepa.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/bdef8a57ab8bd48f6b927e6f97e4222c.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/figazirolotu.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/14697017974.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdf760679---xitunizivojunijusuj.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/xuzebasapute.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///sinorafokevufuj.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/xomojuwirev.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/jijaledaxud.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fulajuvenipebuser.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/89541241944.pdfIn PDF document text
    • http://deforma.it/userfiles/files/26521759898.pdfIn PDF document text
    • https://akvaguru.hu/user/file/7466250676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vertex+form+of+a+quadratic+function+calculatorPDF 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_off0000afbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 10788 bytes
SHA-256: 0363e42492356693614fd37ba834c64b3c731c0fd108da3fd57e78c2af63a744
font_02_sfnt_off0000e073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 15716 bytes
SHA-256: 12e7e115a47b514cceb9a1d0158cb2ca618fe7d76a21b1c00e85bfbe9cc21b94

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