Malicious PDF — malware analysis report

Static analysis result for SHA-256 c080794b077b7bf9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 14:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7e1806be2d8d4018c6be3a2010e5a67a SHA-1: 61769279e66625fc984827ff8817164d320f6e7b SHA-256: c080794b077b7bf9c5f18763211b5bbf826ecb33c745e77540db1ef28eeac0bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many of which are linked to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of a 'download button' heuristic suggests a lure to download further malicious content. While no scripts were explicitly extracted, the PDF structure and external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=app+inventor+activity+starter PDF link annotation
    • https://indiansabroad.uk/userfiles/file/semirenilesode.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/42d77b8b2ac77d5b0baa294c4f929261/sepigubabum.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/ranatumineremamon.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/44139192220.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/26845627147.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/4240502750.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/sulemimizutog.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/wetilopobon.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/xujunabamajojabalefuliwer.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210903104916.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/564880021.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/27020408255.pdfIn PDF document text
    • https://ijp2.com/contents/files/7370320370.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/79820546893.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/sibejo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/46023651592.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vowijoxadapefuviwuto.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed163c3ca6---27673097660.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wonadapuxejeken.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/nevitigamoparesobogetami.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wozelipoxemik.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/40891852330.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/wixenarobofubomekixu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109071652295794.pdfIn PDF document text
    • 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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 18748 bytes
SHA-256: 348fa623649af894ca77b5ba3b73092b9ba4d12cd91d31eb97efa4b641a97081
font_02_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 10480 bytes
SHA-256: 9a2df4d8bbecb0130ba5e800b03691d58638efb2be5fe4314370354bfc93c16a