Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf9d69e3629d040…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 09:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d9551c620ba867575420b125f90f321 SHA-1: abaca0eb4ea9b1da9edbabc375fa2258b6863335 SHA-256: 7cf9d69e3629d040d144f2ee4e0800e1700252941e4a7888f764754f89ea72b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 http://netflor.pl/upload/File/13458757730.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zafuxusowefuriva.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/lagububenaxo.pdfIn PDF document text
    • http://short-story.ru/upload/file/8706216428.pdfIn PDF document text
    • https://rcot.org/userfiles/file/9853500319.pdfIn PDF document text
    • http://benly-carson.com/product/files/20287984167.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/nebipisivofaso.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091906312150.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/sekezavujosujepigidaji.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/wasinowonezogose.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/3312513248.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/jiladafinatajupurudin.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904145254291219.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/vedozagizib.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/vikisoxav.pdfIn PDF document text
    • https://tmtteks.com/files/68294523919.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/6606248858.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/35992863543.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/jamokef.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/17177900922.pdfIn PDF document text
    • http://d-innovation.com/upload/files/notuwup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=level+9+cannon+clash+of+clansPDF 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_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 16448 bytes
SHA-256: 25862389606fce3946a0c5d26105c52965e16ed58adb09391e2dbd855dbebcce
font_02_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10336 bytes
SHA-256: e749af0b59047ffbfa43e4b710abb1e8391c00737e6fd9d9681c01fc5cf54a3a

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