Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0c2391da2d885b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-12 19:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62c39ec8f13e99ae930539895ef8f492 SHA-1: 20ae49d413d68238b5b73a2b1b1336887a4c45d2 SHA-256: 3f0c2391da2d885b71f6eea403f11db0021ca6cbc206dd2153261917db528b8c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to a phishing domain ('vilenefex.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to redirect users, likely to malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=nlp+techniques+list+pdf PDF link annotation
    • https://cdn.sqhk.co/bepoweruga/hfThahf/jijaputorev.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/PhatOHk/sulitojodoxilobapukot.pdfIn PDF document text
    • http://picsonair.com/what_religion_is_judaism_based_onphfnk.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/bamevalojowox.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/jhiJqjj/kazega.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/g9dCi70/anatomy_chart_muscles.pdfIn PDF document text
    • http://mebelintera.ru/nazezvcpwz.pdfIn PDF document text
    • http://cardioactiveitalia.site/problems_with_element_tvt89lm.pdfIn PDF document text
    • https://xodebizig.weebly.com/uploads/1/3/2/6/132681497/tofegigipoli.pdfIn PDF document text
    • http://boothattendant.com/dimam6674d.pdfIn PDF document text
    • https://fivepixulata.weebly.com/uploads/1/3/4/7/134747110/6d7e4eb40e31.pdfIn PDF document text
    • http://damvglaz2.xyz/viper_alarm_remote_battery_replacementycsjo.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/karagalekugus-lanetupuk-lobuzimakemut-bibolikexej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudofekulud.rf.gd/how_do_you_program_a_rca_universal_remote_to_a_magnavox_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/oracle_12c_vs_19c_features.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_f8e1a3966a994f5ea5b5cdf3c61f3f7e.pdf?index=trueIn PDF document text
    • http://luwemazezabubat.rf.gd/messenger_lite_older_version.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/what_is_cutover.pdfIn PDF document text
    • http://fekabama.epizy.com/trx_abs_exercises.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_944659899e044331927f771a7e6a6df9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/68235364603.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/32115231330.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 5032 bytes
SHA-256: a0af9f9fc8c54a517e5953615f1bdbcadc9e058931499e1a3e2fbca7658380f3
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 11056 bytes
SHA-256: 7f2d6b02635f82a1151c2d339a9bb78ed64325d07a0051fe50aa13e60b016db0

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