Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ce45df789c5f43…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 15:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bbd8a05d8049903389c2bf56c97ae1a4 SHA-1: d2cc4d8d3e026e26f0a03788a3a85b0b607f5525 SHA-256: f2ce45df789c5f436576270871d5730e6c0e14c706196bce472dc26d896e35a6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest an intent to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=unlimited+money+gta+5+pc PDF link annotation
    • http://elsped.hu/files/file/guxuzuriruxixizuz.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64625851191.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/2566695479.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/bilodidaxazitilufinopa.pdfIn PDF document text
    • http://elitacasa.it/images/file/60425419583.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422ace5d6fe---gatovatagop.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/93272411044.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/juxexelupixapo.pdfIn PDF document text
    • https://mkart.it/uploads/file/vulawanugib.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/midemuwi.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/22859382689.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/widev.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/85085239241.pdfIn PDF document text
    • http://chamdure.com/DATA/files/64031009041.pdfIn PDF document text
    • https://isosklo.cz/uploads/muzepokufosonolesekul.pdfIn PDF document text
    • http://tavio.su/files/file/kezinebuto.pdfIn PDF document text
    • http://it-hair.com/userfiles/likolodejedume.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/7121957315.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/99040968956.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pebuwapenan.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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 10844 bytes
SHA-256: 7036e2cf6cee7288c5ed2293cb984fb123abcda4a545a89b851345c8c3972c13
font_01_sfnt_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16556 bytes
SHA-256: 060f5cd0254255a8ea33851d93f00ddcaf461524e6db3808cc7b6e220fc219b2

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