Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7eb953ea8fce3c…

MALICIOUS

PDF

79.1 KB Created: 2021-04-19 07:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f051a2e97250e3af5f6076f4fb194fe SHA-1: 241becd63bc4cf02f0f8a4ab49745866fcc4a4e8 SHA-256: 8b7eb953ea8fce3c970f07471a4daa5692d9d6d9f10d616573fd7369e437ca5c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URL pointing to 'golowaki.ru'. The document body, though partially garbled, suggests a lure related to a Mexican holiday, likely intended to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=porque+se+celebra+el+d%25C3%25ADa+de+la+constituci%25C3%25B3n+mexicana
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_564698efeb9f4437a594138b2adcafb1.pdf?index=true
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_77ccd919809a4dd9bd6aca9395b1723e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b76552cf-2ebc-492e-96b9-2f6acffe7d6d/is_black_positive_or_negative_on_jumper_cables.pdf
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_6f8c6c549bba4be29b29bdfb4b4c85bf.pdf?index=true
    • https://s3.amazonaws.com/dozuga/orascom_development_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/b3b6b56c-53f0-47bb-a2ac-850f74cf8baa/wipro_desktop_support_engineer_interview_questions_and_answers_download.pdf
    • http://ninonasoligu.rf.gd/gezavoxuwofulepifum.pdf
    • https://s3.amazonaws.com/lupebesu/76443227913.pdf
    • http://tunowik.epizy.com/joliet_weather_report.pdf
    • https://s3.amazonaws.com/garorowa/kenmore_progressive_vacuum_hepa_filter.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_ef1d3042549043fe9624eef125ebda4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/33296b31-a72f-4fa6-9336-3b053ff16ea0/vba_programming_online_course.pdf
    • http://babazemo.epizy.com/sap_crystal_reports_for_visual_studio_runtime.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_c9be24d7b349495b87ea8eba0b770545.pdf?index=true
    • https://s3.amazonaws.com/guxosa/red_alert_2_for_mac.pdf
    • https://s3.amazonaws.com/zusevamasor/kigoxuvutisatileb.pdf
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_5183fcf010cb44f1a29af071d3071119.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3d4e03c4-2a19-4fe6-9445-c3f47d77a00c/numark_ttusb_cartridge.pdf
    • https://uploads.strikinglycdn.com/files/ddbb055a-0994-4421-8ccb-7ad4ea581eda/ranoroj.pdf
    • http://dolazagoloximip.epizy.com/32943446758.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c8352cc4c4974120b14759011583ed6d.pdf?index=true
    • https://s3.amazonaws.com/xupimaral/86504367166.pdf
    • http://dinaxeziva.rf.gd/83588653651.pdf
    • 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_off0000f26d.bin
c9d4b0ebc5e13981a3a812a5b726bb382e0b38e8878efcc973ec10a5f8f491c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5612 bytes
font_01_sfnt_off00010522.bin
6a2d49158f95458e38b9f4c5feae9307fd7c502f8c5bba72a8956f3b9e9266ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 11828 bytes

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