Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9979c5de7b530cc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 20:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f75ebf9e3a4d14e3afc7eb09fa091f5b SHA-1: 9a6f41eda0d1c454ad11cf98845f6470aa22f92b SHA-256: b9979c5de7b530cc24d6872e368560415d3aff72e55326a51ce456935e1dac7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous embedded URLs suggest the document functions as a link farm, likely to redirect users to phishing sites or download further malware. No scripts were extracted from this sample, but the presence of external URIs and the overall structure point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://nullemont.fr/nullemont/ckfinder/userfiles/files/lofadelevixeravemezenik.pdf In PDF document text
    • http://www.asap-recruitment.net/upload/file/69125904775.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/49643997489.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/boruwobuwonazewekapun.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/79824281789.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/nirijinurapapijo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/govelikuvid.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/34458102258.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/ximavebepizasifatitusimam.pdfIn PDF document text
    • http://ranch.pl/files/file/93365308747.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/seboviruxote.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615080c729308---72843948779.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/durefow.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/85450758284.pdfIn PDF document text
    • http://etnorom.hu/pictures/39890982003.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zizujolejazepus.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/55557424424.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/rifufivonamoz.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/zuginopabegafi.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/62344549068.pdfIn PDF document text
    • http://chinahongji.com/d/files/70516365224.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/17387069036.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/90591668913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=microsoft+excel+apps+for+android+free+downloadPDF 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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 10796 bytes
SHA-256: f3991ca1594701e55919d766234ba151ea3d9d775736951dd0efc157974d1acd
font_01_sfnt_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16960 bytes
SHA-256: 8ab21a7957c83bcdc1cc4e2dbdbc1dbe222ee4068ac53d6691879ae54db0036e

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