Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32ff72255e1aaec…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 07:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca724ba75164dd01aad0775a31bf61d5 SHA-1: 176d398ee7f3bdb9f0fcda5082cf4c81a42c9757 SHA-256: e32ff72255e1aaec9a92b918b08f7f6d9d2571f6fcc2759bec7113f8820e0098
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://seumenha.ru/strik?utm_term=decision+tree+maker+software', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=decision+tree+maker+software
    • https://fepagefifumowa.weebly.com/uploads/1/3/2/6/132681901/a8a0becf8f6.pdf
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fcc5e7e95544.pdf
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nutur_penogoxad.pdf
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5ffa85b2b5725.pdf
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fe9b480e837a.pdf
    • http://koxelomese.iblogger.org/64703517359.pdf
    • http://ferobuxanax.iblogger.org/bipozemabuxodogiresuxela.pdf
    • https://cdn-cms.f-static.net/uploads/4379229/normal_60417edd89902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mokuwanibof/alan_wake_full_pc_game_free.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_87b359dd83d24e828392539011ffc1d9.pdf?index=true
    • https://s3.amazonaws.com/nutanigonu/change_management_process_in_project_management.pdf
    • https://s3.amazonaws.com/defipedibe/amlodipine_norvasc_davis_drug_guide.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_5f2f85fcd981420992f5b8fdf75389d0.pdf?index=true
    • http://datupawop.epizy.com/autodesk_recap_manual_espaol.pdf
    • https://s3.amazonaws.com/nowokil/an_introduction_to_group_work_practice_8th_edition_apa_citation.pdf
    • https://s3.amazonaws.com/widofafane/71881011334.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cc.bin
3bf685d475f800d5858dbe7adb2b199c150028181f20a18e93f5d6ab899f5d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 4940 bytes
font_01_sfnt_off0000f884.bin
df1ab7d54e7ace36c06489e6b017ab7523292342d9136ababc504dde586939ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 11616 bytes
font_02_sfnt_off00011fbb.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 4324 bytes

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