Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fae5e89aa6662d…

MALICIOUS

PDF

90.1 KB Created: 2021-02-27 07:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 349e88f853c05f3e6fae70be50f7f240 SHA-1: 21b876e078db1bd9c7b6a55ed84541f3225495c5 SHA-256: 81fae5e89aa6662d334d196d2de534425e86407a284b6342e293cb8d96580d9e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely leveraging techniques like spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=mxr+10+band+eq+sample+settings PDF link annotation
    • http://rigizaba.iblogger.org/a._chal_to_the_light.pdfIn PDF document text
    • http://girizug.22web.org/gezunelelewod.pdfIn PDF document text
    • http://doorstepcomputers.com/wopaxoforyfdqu.pdfIn PDF document text
    • http://nicechange.space/best_bunkie_board_for_platform_bedqeryn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ffcb484825c1.pdfIn PDF document text
    • http://puxelamonikur.22web.org/tidavevidub.pdfIn PDF document text
    • http://anstel.pro/balopokugapulepafcu7d.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagelojuwe/bhdKbr1/ark_survival_evolved_crystal_isles_crystal_wyvern_queen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_602d565580e08.pdfIn PDF document text
    • http://magic-world.site/pujajotezibarujokutu2suk.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/geLjajd/9457325204.pdfIn PDF document text
    • http://wofeboz.66ghz.com/borenigexezelabe.pdfIn PDF document text
    • https://cdn.sqhk.co/lonubugogere/aheShhF/12th_chemistry_sura_guide_download_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/bZgghhr/nukedunugoxopagonofij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/50500109200.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/dell_inspiron_n5010_i3_380m_specs.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000135bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135BB 21636 bytes
SHA-256: d529dd68b79242a56d4841fbd6caafd116d94901b4a518c5966d294aaf346edd
font_00_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 5812 bytes
SHA-256: 8c6abbeda3dfd002c8cc5135e4e4c7ddab347287cebcb7e27656d704e7eadcc9
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 15124 bytes
SHA-256: 3e05ee46262676ecaa90fd577ee69c114c0ed8d9f64c827dfa441c2c3869e33f

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