Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f89534bbf822b2…

MALICIOUS

PDF

70.0 KB Created: 2021-09-12 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eee182ccab73da14cb1d0e480230811c SHA-1: 2d6a9f91196a8ab34730a9a8becf305bfb99ac01 SHA-256: a9f89534bbf822b271c9f36ae27dd106922f6d2cf310a08b455b1ba50c55128b
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF files hosted on distinct domains suggests an attempt to manipulate search engine results or distribute a payload via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://trustarshida.co/cache/fck_files/file/rekojepukemonoredip.pdf In PDF document text
    • http://eptesteplelek.com/uploads/file/77684516830.pdfIn PDF document text
    • http://ilkemymm.com/image/files/lepovidip.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903200024.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/debemaxiwor.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/58633132119.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/57709574982.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/fadibaguretipam.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/kamopoxujonobezoresoned.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023aec6136---wapodagobidexeligivopu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/jakefelekabumid.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/mategig.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/nifotujir.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/3840566609.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/nomawor.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mudufirevafoj.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/lilibut.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/46260560059.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/48474305951.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/21204576426.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4b453ab---musopuzo.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zaxew.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_747C637D684A9439.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/kunuzosibukumun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adventure+game+download+for+androidPDF 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_off0000b33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33F 10764 bytes
SHA-256: b0e2faf94656572009eec346c11c5645a4fb78c3d040adda76a05969713c1ec5
font_01_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 15244 bytes
SHA-256: 4a6cdf2e327562b9c862d745e1a5433392d7317a450487dd39c8f55b7c5ccfa3

Open this report in the interactive analyzer, or submit your own file for analysis.