Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d84bb92f9a7260…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 011150183419205251260772b21ee806 SHA-1: 607aa2c35ea60fa7bfc7934d87df6eccdd29452b SHA-256: 25d84bb92f9a72605d4956f1a803a97443cf58acaca8927d9c8870913f811b40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=disable+miui+optimization+miui+12 PDF link annotation
    • http://thekitchendesignstudio.org/uploads/files/76762371205.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/xurinon.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/todomasabomiwolik.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wezodatulugal.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/75363380203.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/58174835133.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135c737c0f84---82977093258.pdfIn PDF document text
    • http://koala-al.com/d/files/24592679590.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/tebafefe.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44795630238.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/35369653999.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/xosuzojenebejisafad.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c137f621e9d1b32d02d22c7d51d7ad18/52745584189.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_54806946BA40E3D3.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/86036422517.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/nesimidezu.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/93267494709.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/82584029346.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/75888551098.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mikenafexikaraxup.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/vovaxawe.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_off0000b297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 18816 bytes
SHA-256: e34fd99f20aee8d61e3a4a58457a8ee32f05013519885a76db533556553249c9
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10788 bytes
SHA-256: aa77de22e242e70ac61489a34782caae199b50abc2e181ed04692bad1f4265e9
font_02_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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