Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5d8072161f88f5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e20629e5c36005727e075233ba1b9f5 SHA-1: c8ff5dcdc98d8df28dce66c9540723b77e3341ee SHA-256: 9f5d8072161f88f568f7b9deea4e61c2a9b869de1ea2369ec9f6d53f405fe98c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL distribution point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/60266462606.pdf In PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/b8b7c32256225d3f587a47a95d1d2fa6.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/55641178988.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/xozakibenunabup.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/kirutevexazenun.pdfIn PDF document text
    • http://adice-area.com/pictures/files/titidomazumafot.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/kumipanekigoxutexagafino.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/fajadeferegipoxig.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/84236958062.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vivelifupesujevumivinev.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/mitakelonepogas.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/40718018494.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sowobetudes.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xomonamuzulironu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067b77d368---rubezomizikewapukejaferi.pdfIn PDF document text
    • https://istanajp.com/contents/files/25572577516.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/femonitiva.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/25882605752.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/suviw.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bekufefigutapena.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/74234530172.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/18993693006.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/38074584121.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/nogulat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+accessibility+featuresPDF 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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 17044 bytes
SHA-256: 7d8f868156ca7183bdee50983d15c7a506c602791a66eab02c8241b371790bc7
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10804 bytes
SHA-256: 47b1999c3d224262cc552c1d5806bbf185b9bc3d174b6afbb3f78b0ec38a44d6