Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d8274670c09592…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 19:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b84a8b60bec0403c34c1ca73d2b480f6 SHA-1: a0ea757bba2371fe733ad1071497e53830484114 SHA-256: 64d8274670c09592e9f7d81c4075f2fd206275497858e9e8346fb37c1f721ffc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://monticellotownship.org/userfiles/file/39881243589.pdf In PDF document text
    • https://cet.sk/res/file/nefupajizaz.pdfIn PDF document text
    • https://businesslife.com/content/files/jakazevasos.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/lenolufuvo.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pulikab.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1039416121.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/67313376275.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/ruperani.pdfIn PDF document text
    • http://forti.in/userfiles/file/gagewefopunotibexetoneg.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/9426947756.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/25950051088.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/45857741882.pdfIn PDF document text
    • https://granitnet.hu/editor_up/ropexawinotebixa.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33251707924.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ruzixibivuxarek.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109011706179107.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/jutazameguzizavab.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/rejakikepitik.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/52304162726.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/8322329416.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321ec9e3d86---rinev.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/mupepefizafinerevaxude.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a61ea9d501e103f2613641866314f790/61614962567.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/zutisipirijokabisotoduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bad+effects+of+various+festivals+on+the+environment+introduction+pdfPDF 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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 11104 bytes
SHA-256: 258a2b1fb9e411545c5fd466426662dcb9ebfc31e20a7c3a8e9b0cfe794e6268
font_02_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 15904 bytes
SHA-256: 88ed993893697f342c4644d5710da7e8ca946425340e9344244297b6ea162af2