Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb94ded4d7335e5…

MALICIOUS

PDF

76.4 KB Created: 2021-04-14 17:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b0a1585f502c45f5f1b87c8791e8bff SHA-1: ea68537d6ddef712e91cfaa561fdd57607a9ba8b SHA-256: dcb94ded4d7335e57d3eb3783eee2f382838827885bf98e942c7598a9b5d91f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The heuristic analysis revealed a significant number of external links, suggesting a link farm or phishing attempt. The primary URL identified is https://soxebez.ru/strik, which is likely part of the malicious infrastructure.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=is+lemony+snicket+dead+in+a+series+of+unfortunate+events
    • https://cdn.sqhk.co/daribugubive/hdyjc7X/beat_hazard_ultra_apk_2018.pdf
    • http://kutejovanog.getenjoyment.net/account_ratio_formula.pdf
    • https://cdn.sqhk.co/jifedibodo/jasifgh/three_kingdoms_guide.pdf
    • http://idealica-italiaufficiale.site/windows_10_install_black_screen_no_cursoritxdh.pdf
    • http://znohist.site/verbal_reasoning_practice_test_ucatsye5y.pdf
    • https://cdn.sqhk.co/jimevexir/iM1icge/69828957118.pdf
    • https://cdn.sqhk.co/foseziwate/RSgdOic/pivenab.pdf
    • http://creditscoreusa.info/walmart_grocery_app_for_pc703ls.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bufijonewufo.onlinewebshop.net/d_d_3._5e_character_sheet.pdf
    • http://kakuver.rf.gd/90875473331.pdf
    • https://s3.amazonaws.com/sowewazulejewi/15827027540.pdf
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_fc78a080aeb24c54a51f1eb8a51e6fbe.pdf?index=true
    • http://gifetezese.rf.gd/2227200145.pdf
    • https://s3.amazonaws.com/fogibi/25621399391.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_153a637501f04eb79bc936f7b53613b3.pdf?index=true
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_766fe7c5a63942748d24e8a552c1966f.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede8.bin
769d7eddb590fc879b6f084ca48c4a1e5ac01524ad07ecea4c2bb31441ab63ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5328 bytes
font_01_sfnt_off00010003.bin
17ae39fe6456f3e3f04b9681e62689a067a864a4f0cb79e695ca772c051d1e39
pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10712 bytes