Malicious PDF — malware analysis report

Static analysis result for SHA-256 c549301a8c0ff5ff…

MALICIOUS

PDF

73.2 KB Created: 2021-10-02 22:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 846d56fe870b8752cefded040409ca29 SHA-1: 307cc3fd5af54e748c6b3bfbbadea57ab35d53f3 SHA-256: c549301a8c0ff5ff473b80473b5fe8a505ec0412eb82c3c2a878f1a352f89c98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution campaign. The presence of these links and the overall structure align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=baby+not+taking+pacifier PDF link annotation
    • http://philipp-haberland.de/images/upload/file/sagulewo.pdfIn PDF document text
    • http://saint-party.com/media/file/83397466371.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/39053721823.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/gojalox.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/98364876486.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109040000248296.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/91176105033.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/murusidomuzabifa.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/5626725615.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/sojomewegovilipavixasav.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/89251428868.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/matef.pdfIn PDF document text
    • http://word.mn/uploads/assets/84622246300.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/nawodepopixukubosiwe.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/88324384542.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/95592702383.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lavetemuwidarupomoz.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/65407147959.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614172a846578---51902485137.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/winelugokisefifun.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/setotixomuvitusabutu.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/26700647661.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/rulunuxa.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/40690067670.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/83052373326.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/40583968064.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_off0000ba18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA18 17080 bytes
SHA-256: 33ee658111b7059e96bc5bb3a99bd0e11c136b6d7d52f1f9fefbc250b0db8092
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10840 bytes
SHA-256: bd541731029c9039383bb9e277b72beadd01005b50d389ee8364fff1bf2b5325