Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef717d102ca9d92…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 14:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2fe8518a3259e7500e3c32fe0646cd4 SHA-1: d9e20de61e0c1acae7332a604bfcd77cc40e2cc7 SHA-256: 9ef717d102ca9d92b23e2aefd39fbb2abc5ef0f43f5b20ffd6efbf7ad6f06c5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm, likely intended to obscure the true destination or distribute various malicious payloads. The embedded JavaScript is the primary mechanism for executing the redirection, pointing towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://proficlim.ru/public/userfiles/file/66447043075.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/21184759210.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/newugod.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/voxozeduzopuwafur.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/21924082342.pdfIn PDF document text
    • https://vleek.com/uploads/files/5867991640.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/mutil.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d338e0fcf---lovikojovekuse.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/3966009043.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/lonirefapunebiboxujeda.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/82228175938.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/befumamesow.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/94609299647.pdfIn PDF document text
    • https://icbacademy.com/upload/files/59561923660.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gitubogeferizuguta.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/22529780927.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/pumetapalabogo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/86152813996.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/7908834404.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/nijuwurur.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee326a502---18734671115.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/77951841011.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/detikodobapodik.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/lovemuropuwuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+need+for+speed+for+ppssppPDF 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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16888 bytes
SHA-256: 4b918ab96092f363fbc512ce78f98bf19430e9fedaa3e820dd03ebc1d097655f
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10388 bytes
SHA-256: 07b7d2f845f008c22869be259c5f9f0807a2caaaf7d228dd287cc299346f842f