Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0d787f2ae1905b…

MALICIOUS

PDF

113.9 KB Created: 2021-09-08 14:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2aa571cb4ffe5b6c83c07c7b9aa0ca0 SHA-1: 70147202a87e165bd4025bc9204244147e19838e SHA-256: ba0d787f2ae1905b7bc1fb27125c9c64990880faa60bc4ea9c780144ded20034
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm with many distinct hosts, including a suspicious PDF hosted on 'ambvetbrashersclavoghisu.eu'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ambvetbrashersclavoghisu.eu/userfiles/files/bodowubagimufiviworef.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161381baf6155d---fumigodapalitadax.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/37865349717.pdfIn PDF document text
    • https://anup.bo/images/files/jobugim.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/72031617370.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/79611992292.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vimuvowelajazeninegeseve.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/79107725242.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/rivetabiviravejeb.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/11034703959.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/38992185893.pdfIn PDF document text
    • http://apicn.net/upload/files/64893188955.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/14381196048.pdfIn PDF document text
    • https://harmony.im/userfiles/file/24735165253.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326da534a30---8954442020.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/22100664117.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/54766797471.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • http://xtra360.net/campannas/file/10487689202.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/54890953556.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/jisobavejijujivefosifuxej.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/12027638889.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/72311901902.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/49460604900.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doboxagozalerunexibize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+materi+biologi+sma+kelas+x+pdfPDF 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_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 17592 bytes
SHA-256: 5872bd825420fae106e28049b591530c8e28c5eaa404516f61efc11f776eafd0
font_01_sfnt_off00018754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18754 11260 bytes
SHA-256: cfa4baac56adddc12f421201f0e2124a9897a259bde69644a41210010944ae77
font_02_sfnt_off0001a15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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