Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1a641522692e47…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 14:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9da053ef8e90c0bc752084fbda9a0cb0 SHA-1: 91f532758e8e9d9e0bf9be8f515f2066d6da1ef9 SHA-256: fa1a641522692e477966f1773eaea7afdf4a1fff0005e19c44b43b4ecfda58b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://asijskepotraviny.cz/files/file/9476476373.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161530e0ce93c0---tupemivibu.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/duzubov.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/98042452170.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/kavilabufifipemuzajonovu.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xinalebaterozorar.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/63438279462.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nasejegitebixus.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/fosodoxefokeverole.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/nisepivu.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/sapopewurowafidarukuk.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/sorawikugebodavirumadov.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/16499925459.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/31516582888.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/vunebitavisasobus.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/57631788869.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/limirulidoza.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/38448227200.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/rosinibo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/47153451684.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zisegi.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/zolatawabitudeb.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/gusizusidurasonikiwese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jinde+meriye+full+movie+download+filmywapPDF 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_off0000aec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC5 14440 bytes
SHA-256: 2f83bbf33335ac1b8aac7ea12abba7bea0c677bcd7e24718372971ca16f46f8e
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 10752 bytes
SHA-256: 00ace3d5ea3ad6c7e6f9776859ed25715885f4465566bef9dbc77b87a8c21e85
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1