Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5094de6bddeb43d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 08:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3fbe9fe49502617444cb2622e5e40dca SHA-1: f652924a1a034861450f9ee481095604c7a3fce9 SHA-256: c5094de6bddeb43dac9c44e33bab6fd7e0cbf2d236483c2f95fd2b2c6ca38b81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kapalishakti.com/ckfinder/userfiles/files/38738767857.pdf In PDF document text
    • https://alpinashop.rudy-ra.com/files/xogofitawudewujalopovelam.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/54342471748.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/138199457.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/nonululifolovugeva.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/32606388445.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/86971906885.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/sivexegawajujas.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/jikajid.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/letimebagot.pdfIn PDF document text
    • http://freetds.net/userfiles/file/torumarubepakumesetijafu.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/6951803629.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/bikomebogimufevad.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fogezigijatiri.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/dolunuseriniwupabupi.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/17595462993.pdfIn PDF document text
    • http://taigesw.com/upload/files/zadumupeze.pdfIn PDF document text
    • http://dges.in/userfiles/file/jatawodorofeduwofizevote.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/93726317035.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xeritetadi.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/68261152263.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/wesoko.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/nomafimefoxap.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/wesisiteranofilelanop.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109050653435226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jurassic+world+fallen+kingdom+free+full+moviePDF 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_off0000b968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB968 17492 bytes
SHA-256: a32def9fb8bef185ee723993e4b4f3df6130f2d9ea93b945e03d9c227c196ce4
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 11056 bytes
SHA-256: 70b70f9019335a21056d2bc08a6692660c636ee7a4d532b8f1cdeea58aff8086
font_02_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1