Malicious PDF — malware analysis report

Static analysis result for SHA-256 e745020dd9c908df…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4a1497b19a3bb7e91b8c07230bc25b6b SHA-1: 53f0cec39c20c07c8691c5802deb636b4315c32e SHA-256: e745020dd9c908df75dd0821384daf9a76dc2fe91aed3a99639e34701c17b8b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://klick-tipp.at/ckfinder/userfiles/publics/files/6679382799.pdf In PDF document text
    • https://eslms.com/userfiles/file/34871631809.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/rukunimegofivo.pdfIn PDF document text
    • http://vit-physio.de/file/15924672606.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/gisagizo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0286d706f682256d5fee092bb5d975cf/wugesiwi.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/15823357363.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdfIn PDF document text
    • https://phr4u.com/files/95291609165.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/82236642806.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdfIn PDF document text
    • https://southafricapools.com/contents/files/33127480520.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/romavisexebalew.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613299fe3b8f4---jifoselupiwufugeruvare.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/pobaxawazubezafokuvute.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xozix.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/82678196176.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wujevanitusifekoxakifepud.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912070853458930.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98260591749.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/sudivokasetoze.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pixaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=copy+notes+from+android+to+pcPDF 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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 10880 bytes
SHA-256: 078979a158d410646d299aa138e9f43ccf7f4222dfe6fdf1c84e7b265efaf719
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 17228 bytes
SHA-256: ec7bfb70a29f81e12601c03f7270c1c1171d6f8627d10c6421d9ca711b0970ae

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