Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fb05f7b6506829…

MALICIOUS

PDF

73.7 KB Created: 2021-04-03 07:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c4ad58e409c284cb4e20f9cde6bebaa8 SHA-1: 67e833429ef078fbb12fc29aa04f30abdca8cf81 SHA-256: 77fb05f7b6506829c26bd9d0bbcdb98126e3a9cd22612b5945b7abc7ed21349a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains references to 'unblocked games' and authoring information that could be used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=unblocked+games+effing+worms+2 PDF link annotation
    • http://vipadminler.org/world_history_study_guide_unit_1jtx7p.pdfIn PDF document text
    • http://moxumepavigotuf.iblogger.org/24231836581.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/12233299956.pdfIn PDF document text
    • http://construt.site/34399943314x0ojv.pdfIn PDF document text
    • http://zikizitepef.iblogger.org/difference_between_ruger_lcp_and_ec9s.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/biozone_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461516/normal_5fed323e6c36e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_6064e2fba2d46.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/72556573488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_604a8a0b9620a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_259eebd19b5b451aba85bb4ba52bfe31.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_f049780b46d646fb90b4b84134e314b9.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_cb97a511ce104bba9da286477a8e6312.pdf?index=trueIn PDF document text
    • https://bfb79b04-db4d-4c54-a74a-4733ff68ceb9.filesusr.com/ugd/11291b_d886a1b3a2674f619d0f3e9fbbbea455.pdf?index=trueIn PDF document text
    • http://sanojepenot.onlinewebshop.net/excel_vba_function_return_value_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e700418c-8230-4eb1-9b0f-803dbc6dc78e/9579072451.pdfIn PDF document text
    • http://wesonujojamoga.epizy.com/stranger_things_season_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8fd481-13a5-4a36-ab7d-7447786dfb92/2006_bmw_330i_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0cfe6f-5d50-4a65-b252-8d4ec035643b/mugikiwaki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 5468 bytes
SHA-256: cdb34c9792dc5df2ad07b03e0ce169644e10319d0d131aeb89a70c19bd6aa728
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 10516 bytes
SHA-256: dd7f1787eb276dd5835ef6a4f6c1de40523951ccb65c81496c5284128237da8f
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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