Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c7f77b636ea4fe…

MALICIOUS

PDF

88.1 KB Created: 2021-09-17 07:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ab4444875e9790e27b581e76b8c8506 SHA-1: 50a395657e600258ba5e4fa28b6a46ca3cd1846a SHA-256: c1c7f77b636ea4fe54473dc2da77dabb5d9e4a5cf3e9356d2b037230813d1202
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are classified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://un7un9b3rl1pa7-99.com/contents/files/74876039731.pdf In PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/27831498117.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/belesimajavur.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/rupamadigimeka.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91543591063.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613851bab51e8---rutabubumobujetizukesakax.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/60128625546.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/37349803186.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/files/runorejenefapinujajuvewe.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/25458249251.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vokekazadofidikuwekusituj.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/lufizorowi.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/85066804023.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/wevajunixavodut.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zuretidodiwajevovowage.pdfIn PDF document text
    • http://acelybio.com/upload/files/45204614414.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/19795997733.pdfIn PDF document text
    • http://ilovestory.com/upload/file/37809452065.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jitutidivibufakaxetud.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/60393390462.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/delazoxabu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/17265793221.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210912071739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=omegle+start+videoPDF 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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10576 bytes
SHA-256: 316f5cc4c62dbaf196d17c52f1c1633f3b05951e96a4b801bd6a6bc062f3379c
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 18100 bytes
SHA-256: 18adfab7d741eb61e2cae2053659dadd7e2298e12809dd2903cfa857af2761a9

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