Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5040536c49954a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 16:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91c60b974174c8b33d281e48c3220af8 SHA-1: be4bd3783f3691b6440fc1f56386dfac7eef9975 SHA-256: 2e5040536c49954a5c2236dd22383d52553d7df9f693aeb1455186fc6bfb71b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO-based attack. The presence of multiple external URIs and the link farm heuristic point towards an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://como.gattinonimondodivacanze.it/themes/userfiles/files/18255221434.pdf In PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/39521924014.pdfIn PDF document text
    • http://nemalipics.com/sisesoxezenajigigizu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/22549885363.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/tixedatidasil.pdfIn PDF document text
    • http://guchen.ru/d/files/7534455228.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/ritulumuvurelumefuluxedo.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/xiwaro.pdfIn PDF document text
    • https://cargobull.cz/res/file/vuxositakavafiwas.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/21184977381.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/lenitemute.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/82424225458.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mafilaluxojuximetebaz.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12329273175.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xobod.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/zuzudetotulorixinuw.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kazajadizedamovezorere.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/89914086382.pdfIn PDF document text
    • https://totounited.com/contents/files/loxitebu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/95913290699.pdfIn PDF document text
    • https://asiapharma.la/files/files/fajozonenivenavejatikunu.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/54278907949.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/aecbe605a645f313c054cc85b943f2d4/73143162055.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/49351297471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=oxford+advanced+learner+dictionary+for+android+mobile+free+downloadPDF 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_off0000c5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FB 20036 bytes
SHA-256: 96ed5d7ebc876dbe28cf61ba49514f35042d3ed68dd2df1fdc6fab6f94da1f2e
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 11004 bytes
SHA-256: b8594243ec4e30d28684fe17e43eede4b1d5fa09feb219d18cdff5481c801939
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1