Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fa499d312ac52d…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 09:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b01df73a1d6d95260c91d719baa17deb SHA-1: 4a12543853cde2fb956c63787b7663b02f383588 SHA-256: 97fa499d312ac52db7fd9f8e313c40eacdbf632adc2c3b22b53655b057b18e82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains numerous embedded URLs, many of which are structured to appear as download links for files, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=gta+3+cleo+apk+download PDF link annotation
    • http://myoffice2561.sesao33.net/UserFiles/File/sosikefesenakidibiku.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/vajepezej.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gelinabenevoboxekafiviga.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/87486067111.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/13558050965.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/9791018094.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kurogijixexik.pdfIn PDF document text
    • http://fitviewer.biz/files/file/47921427925.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/77148154419.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/79997553714.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/58626122350.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/38674218671.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131219f5464b---bajugezivukojefobisuw.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/mipafixefimadodavelukis.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vikexiw.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/fovanusol.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/bolutoxojozisokutepet.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pubuwimofitupobex.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36467014504.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/45082082012.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/65641318589.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/54736909331.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mewuvimujipusapuro.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_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10536 bytes
SHA-256: 795a19698059e0a9699276e8a9837bb0dff1a53b0f4f432edd54fa5fac9734ca
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 17932 bytes
SHA-256: b9b4d5db26ca562df72bce59ed0e2710ae8be8791bbf526807cd34ec024d2595

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