Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31235b89fa63fc2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 21:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 084a5c8bd13652dbdb5611d6f96c159d SHA-1: e650dd1ee5472ecabd551889abfac9b43c3a2252 SHA-256: c31235b89fa63fc2bdf2097f7be60f15c13c1a7c3ab2c29d2b8f61f060381075
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=best+dark+mode+extension+for+chrome PDF link annotation
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/lalulipemot.pdfIn PDF document text
    • http://onhimalayas.com/ckfinder/userfiles/files/29635448701.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/kupuxitezenu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/savuneropetajepe.pdfIn PDF document text
    • http://iltorg.ru/upload/file/28148386684.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/zepibelesisewavazafov.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/revimoxufadeneb.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/matomovodesetipavem.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/19862572299.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xunip.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/delisizisexixapi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/risesidog.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/1759540223.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161369b6d83cb3---jinabadutuseb.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/92598451541.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fisusibog.pdfIn PDF document text
    • http://topp.pl/_topp/file/goxuzarawagoxat.pdfIn PDF document text
    • http://ciskmv.com/css/file/puvatopuzalot.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea806a5c22---lezigonar.pdfIn PDF document text
    • https://intersat.lv/files/file/bomexo.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631301621.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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 10944 bytes
SHA-256: d40a27c164691ac01f74abf8f868135819461d306e3e2e7c0373b7699d547423
font_02_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 18292 bytes
SHA-256: 9b6649be9d341bc675d1d921b9dd3e48850c17ae03756be3c1d0a818406e2b65

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