Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb958b561b6f81c…

MALICIOUS

PDF

74.6 KB Created: 2021-02-17 01:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7eb0bb06768991a95ad699d36d2aac2 SHA-1: 25a0eff32b42d1b12a9bf78080c30ad11a1c3fae SHA-256: 8cb958b561b6f81c451bc69fcf69a565cc96be056c86fe688f972d73cff95c75
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=how%20many%20chapters%20are%20there%20in%20the%20nec'. This URL is presented in a deceptive manner within the document body, suggesting a phishing or social engineering attempt to trick the user into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=how%20many%20chapters%20are%20there%20in%20the%20nec In PDF document text
    • https://cdn.sqhk.co/desiruzag/hdbBIib/plants_vs_zombies_download_hack_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60171dacdd176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6012f4fd4350c.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/rasotujizabaziwa.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/gihfJG7/hackers_soundtrack_rsd_2020.pdfIn PDF document text
    • http://shoop-fm.ru/hoppin_mad_racing_game4hpn4.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/hx697jj/segafubidobalurusaxevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_600cb5178cd2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ff3838f95e74.pdfIn PDF document text
    • https://ratofesut.weebly.com/uploads/1/3/5/3/135304008/f6aae2ff8d.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/kerivoruniraf.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/XhfHrMv/55992985184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/23890140599.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/zegebawologivak.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bash_scripting_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/cisco_academy_chapter_5_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/hubspot_sales_software_certification_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/48700656556.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/mod_minecraft_pc_1._12_2.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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 5296 bytes
SHA-256: 756af4dc5ac2517885510a2f6279110d97e17c6e5bbe99c5041352df530ca43f
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 10432 bytes
SHA-256: 75a90dbbdb4fba4dc1b5fb0b0319f52dcfa2864ef09a81b79031a9e6a2fb16ff

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