Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22f2e10b61a0031…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8e82746fee66337662c9eefe9ffee43d SHA-1: 5fa100a64369448579e807eaa19500137b0eaa0a SHA-256: a22f2e10b61a00319880db983b895ef2c4bea3fcadd72e4c8864efde8b5c9d20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dorekusamiki.pdf In PDF document text
    • http://walosports.cl/userfiles/file/pegupopenugaxi.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/2638509844.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/mamasinenas.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109072348279309.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pemalanuzawitikuriranek.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/49124751450.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/nununubug.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/masexodubunomoxobelut.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wijoxamu.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210904064347.pdfIn PDF document text
    • http://salt17.com/userfiles/files/gigivibol.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/94847380124.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/74336226137.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/39884709911.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/5658353134.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/2396967516.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210903095551.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/70294326645.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/40854192119.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc86582b---62131885692.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qg4nb910u8qt6m628jo0tg8h5q/24404705977.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/kukezed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wallpaper+for+android+hd+4kPDF 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_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 10492 bytes
SHA-256: 2332b0821d1645c0f0d9a090f17ff788322cc99d20fef396396797de19c95d0a
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 17812 bytes
SHA-256: ddbdcb0fdd4f6df8a55eff19df9d1c82a44ee6fc71d42d85bf0bb6fabee93a3e