Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbaa3a3d59d5088…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 16:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bea5e97b4f1ecfc8dcf28e5dccf4c1b9 SHA-1: 39f1d425f660988bc783489f9b2892d0e36ee411 SHA-256: abbaa3a3d59d5088a3fa66e9667c496e8640ba21c88a8055d3723b2cd843825c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cbgnfinance.com/userfiles/file/81760262799.pdf In PDF document text
    • http://canadanur.com/resimler/files/6143759250.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/94161777178.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/21549349585.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/9150062551.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sasepakojuriri.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/57645929087.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/pijisafagisomezetug.pdfIn PDF document text
    • http://kme-kme.cz/files/file/jamifenizi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a67cb4e83---3463818014.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/1982020227.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/54566797974.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zezetozasapapaxeva.pdfIn PDF document text
    • http://rjt1.org/upload/files/lojozazit.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zezobemigebiwagoxovepuke.pdfIn PDF document text
    • http://muszempilla.com/files/file/waxuxifepigulofewe.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/lotam.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pokejuruvub.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920082130_15isxa.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/99804931947.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/joxagomabepuzuwijewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=videomakerfx+software+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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 18372 bytes
SHA-256: ae00e8411c3884cf339837fab96b1bab90014492cb6665748cd4d8dca7065191
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10764 bytes
SHA-256: 0fd985d2626d90c828703ecff61888b6a7be3f640e95259049595653d22af0bd
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1