Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fa643d3fb747de…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 21:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 468d0ab2916b04e2e7a73a49082270e2 SHA-1: 277dd2cf803d42a4d9b5dee7287e0fc4a702e8a7 SHA-256: 32fa643d3fb747de9779f83bb43c3847fcc27d0933ac6e4c327ea76d9808e82c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a campaign designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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 https://crysiq.ru/uplcv?utm_term=two+step+inequalities+worksheet+coloring PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/zumukusapuxo.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/75382854822.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/webofu.pdfIn PDF document text
    • http://ilkemymm.com/image/files/95261087374.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613508616f86b---41623945666.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/95006368676.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87012885372.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/88007150890.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/tijusibapugodog.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/65613990734.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/nulaxividoxi.pdfIn PDF document text
    • http://techmechengineers.com/uploads/mupatadewepasuf.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/52208014620.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/parafelagegobuli.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/76806308628.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/42543191151.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/55691378995.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xojun.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/859b54ceb3ff965ffe061263a21e2027/47338777337.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/zigib.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/rudovenuzapomate.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210907090100.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 11040 bytes
SHA-256: 7e612cb246bf0fcec8f94b78196cc6df0fccadfbfb6df8c95dabf58c519792e2
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 18564 bytes
SHA-256: 4cc63b4d3eb467e158b866bbc738ce80726fc100da4a7b39c194b39cc5ae154e
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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