Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d9b2858d7fbce0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 13:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fed2abdb393d8b548faf59f01bd7fb48 SHA-1: 97c70bdb35d9136a590f1731a9841718b6d77742 SHA-256: 17d9b2858d7fbce0a7465957c073ebd391df1933016c9aba9401013747c82e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ccadl.com/files/20210907010501.pdf In PDF document text
    • http://weiddy.com/uploads/files/202109082342369850.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/pemuwobolikosafizi.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/349892946.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/vinopalutes.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/vabugiminepo.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/16741090321.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sojeduruzuk.pdfIn PDF document text
    • https://nexusmediation.nl/files/19839016282.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/sigoxun.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/durufomixupoxepa.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/40151413730.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/136056444.pdfIn PDF document text
    • https://ka-base.no/images_content/file/rotipawabimunidu.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/39508001863.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/76726418356.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/rudikomulajalujaweze.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/navawefipot.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wafonidizaxamumibowezedow.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/kuwezotar.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xidevunoxurunasef.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zuzaxikexo.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/84331531741.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/kejaled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=poco+m2+pro+android+11PDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 19316 bytes
SHA-256: 2b884650fc7a62dfea06595659e8d2d0fefd5413234fe4a9413e348d92c4a6d8
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 10404 bytes
SHA-256: 12a97f41e6aaf6440750fa63bfe1a3f3ead527a510f38667de4a5eadd54ffdeb
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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