Malicious PDF — malware analysis report

Static analysis result for SHA-256 94855f5793076666…

MALICIOUS

PDF

87.3 KB Created: 2021-02-25 03:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d70d64df8bede02560442ec36f5c541a SHA-1: 9e1f78dca4b0b2cfdcdc0661b529595867b3d3e5 SHA-256: 94855f5793076666f1e9d42d494990f63b3718062ae46518219f4475da07bf70
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+connect+chamberlain+b750+to+wifi In PDF document text
    • http://khareedforosh.com/jimirejurimeviliwi01x67.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/idJulbz/efootball_pes_2021_lite.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/best_indoor_soccer_training_equipment.pdfIn PDF document text
    • http://lupaper.22web.org/autocad_2013_free_download_full_version_for_mac.pdfIn PDF document text
    • http://basiditdcf.space/how_long_is_pals_renewalkuvow.pdfIn PDF document text
    • http://nowtorrentz.com/vehicle_tracking_system_project_in_android2rjfj.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/89PwTjj/dream_tiles_kpop_2020_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/V0YzPQS/board_games_for_5_year_olds_smyths.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/tejamemiwuzrsjwa.pdfIn PDF document text
    • http://dle-tpl.site/environmental_health_risk_assessmentqfrwk.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/51758753330.pdfIn PDF document text
    • http://bit7.top/best_android_one_phone_2019_uk9f7s2.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/99754505387.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
    • http://lejaget.epizy.com/honeywell_digital_round_programmable_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/adding_money_worksheets_grade_1.pdfIn PDF document text
    • http://rasukadixekurij.rf.gd/sri_ranganathar_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/dasukuvironepit.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/football_quiz_questions_and_answers_easy.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/volume_worksheets_5th_grade.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/44505147997.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 5272 bytes
SHA-256: 409fecd2f92b06783819265f6d81558b32b9722b516088155833dd1deb4dbee4
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 11264 bytes
SHA-256: 11c81fa461869119ea1c3e1064c9d8855ec7359ef96e9b2a9076c894b8f3d7ea
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee
font_03_sfnt_off00014108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14108 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c