Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c7af7e3283c324…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 16:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9a3deb2543da6e5f499a670b48da15d SHA-1: 7fc184152c35eb60e776cf5ead4cbff56e8e5fcd SHA-256: 32c7af7e3283c324b4e6c4cba3953be4f6614875eaf9be83a08ab45d07c0af6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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 https://cructi.ru/uplcv?utm_term=nba+2k14+android+apk+game+nba+2k14+free+download+for+tablet PDF link annotation
    • https://ukmalayalamnews.com/userfiles/file/jekanovosisenid.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/gunel.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/56131370310.pdfIn PDF document text
    • http://effekt-film.de/files/file/birejosafef.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/wulesave.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/78152239891.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/rixasowowatezanarog.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/71161808552.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/92875448693.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xununapojimovoteduwuni.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/6322381955.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/gorivowitunixe.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/84005412144.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133427c1dc3d---vamik.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/pusotisesajej.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130585c3e14e---wudojujipividizarifu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631609508.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/48876262788.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3E 19160 bytes
SHA-256: 305d98d6b9ada819da54c76eac84ec99e26c9c74e5d0ca1b346f7f40fac482d0
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 11220 bytes
SHA-256: d2f01e2078b4b6828e34f41ed39654b421d28ff33a141ab701e8528ed0e35650
font_03_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 16280 bytes
SHA-256: 6c2373af9f418d6bf213df99f682b881f883cc510106bad74565fdf518858d7f

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