Malicious PDF — malware analysis report

Static analysis result for SHA-256 25290dcdfc87871b…

MALICIOUS

PDF

73.6 KB Created: 2021-10-02 17:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4071a384fcf68ead03b5cd8a1fd4abf9 SHA-1: e6d5e925018e2814379b4d5f56d79ee92b3053ca SHA-256: 25290dcdfc87871b14aa73856856826ebd986b6e2262119708a82e8b199983bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. The PDF contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://duonglaohanoi.com/userfiles/file/fodakifevosubikevogifag.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/4339deadf3b5f68359172d5196ac187d/81647786969.pdf
    • https://motecx.com/images/file/zegokimejowuxej.pdf
    • http://sujitonweb.com/userfiles/files/bipolodututebowug.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/58718342067.pdf
    • https://isigakizima.net/img/tmp/file/45663377064.pdf
    • http://yugreat.com/filespath/files/20210917103222.pdf
    • http://beiks.info/public/file/22063429997.pdf
    • https://infrastone.com/userfiles/files/54268290881.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/534r38qj8g1hhab3l3mgql9ch8iragtv/55831616036.pdf
    • http://rentbucharest.net/images/userfiles/pamodeduje.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/13597136116.pdf
    • http://fotocaroli.it/userfiles/files/zapugagazutesixobozaj.pdf
    • http://systempro.kr/userData/board/file/48872883024.pdf
    • http://vecsecity.info/editor_up/tadil.pdf
    • http://qlinairnv.be/userfiles/file/50587392819.pdf
    • https://b2bpro.xyz/userfiles/file/wumofedudadasuzimalifu.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1632664327.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/vazetuviwovi.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/serokivuvedexobevobozezet.pdf
    • https://blgjad.com/upload/files/zojuvedimokupitovideje.pdf
    • http://misosmile.com/upload/editor/files/biforupafipajowi.pdf
    • https://sharjahcements.com/images/bulk_images/files/ribemitisegawak.pdf
    • http://nguoigiupviec99.com/webroot/img/files/dupoferuvireb.pdf
    • http://droneducational.com/admin/userfiles/file/lomawo.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/lurozamuso.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=moving+armor+stand+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b923.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 16792 bytes
font_01_sfnt_off0000d13a.bin
7ebc925432449d4a99efdadf3b00569765059b55fdc66e8b463ae6bdf52b4d5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 10832 bytes
font_02_sfnt_off0000ea14.bin
4b3e7f32b20a6ea2258eea361f0b2c91cb568f3567e20ad93d8dc7e3d75382b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 18020 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.