Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc5cca4df5286c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 13:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 883ac85a2a7c1e5dba63414dfbbbfce3 SHA-1: fda8dfcca40be973143bf5efbd834d2ffa69891c SHA-256: bdfc5cca4df5286c97382d374005925afd9216899b2da906d0d0aad22cb47289
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://scouttautomotive.com/editor_uploads/system/files/dipegolej.pdf In PDF document text
    • http://huile-de-nigelle.info/userfiles/file/pejimanemedi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/surarijadijivetiro.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/22619771661.pdfIn PDF document text
    • http://jobsmarttampabay.com/files/public/vikodasizejivogokirifawub.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///xozaduvazixokor.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/51957384137.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/45784904320.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/gibaweledomaxetuko.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/4540521418.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/lamubadewevino.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/faguponeti.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/jiledoromami.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/81274293934.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4en21i4d4j2bs52d418m3f7e13/mejezapopu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/6121773680.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/70690142508.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/21157893808.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/15353143633.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18287377240.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/lamofaguwoketebusosa.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/88262480443.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149276c701a5---50198748628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gs+auto+clickerPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18504 bytes
SHA-256: 7e7c1582411ba53daf31fa5e10b4e11b7de9266a037de2e4d6ae0e974c76fd6c
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 10352 bytes
SHA-256: 96287fb1cb64319c926fc9ee15536a61014771492562443274c4be3967198c96

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