Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f696233b7d5f5…

MALICIOUS

PDF

131.3 KB Created: 2021-02-17 18:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0e4bc5b08523b29611ad10ec3a79282d SHA-1: f3fed5e6bf4c9f7fe7a27c20e9fbf0f4297e66d7 SHA-256: 9f5f696233b7d5f55722c07ab4b57770ae895c094b9f9e92d9c3e33a032c4810
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search terms, likely directing users to one of the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/wix?keyword=what+darwin+never+knew+worksheet+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/letijefa/dYWtLfJ/hill_climb_bike_racing_3_online_play.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/174634.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/dijjjxX/pee_sounds_app.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/jitamojinasubatom.pdfIn PDF document text
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/614edde039a57.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jiDDjb4/zudupadezurewow.pdfIn PDF document text
    • http://kozupuj.iblogger.org/tell_me_about_yourself_interview_answer.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/kabirafo-porofa.pdfIn PDF document text
    • https://bavoramexur.weebly.com/uploads/1/3/5/3/135326869/2e65adbe85f.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://fokoxowikelejex.rf.gd/agile_test_strategy_template.pdfIn PDF document text
    • http://kifozelig.epizy.com/accidente_cerebrovascular_2019.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/vesicant_extravasation_management_guidelines.pdfIn PDF document text
    • http://jatuxijor.epizy.com/comparative_and_superlative_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/2019_dse_physics_paper_1_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/79723036639.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/42313380072.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB9B 5116 bytes
SHA-256: 74312282a0af46b930abba924c64886c92f85e4fe869acb4214eb9de0593855a
font_01_sfnt_off0001cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD10 10488 bytes
SHA-256: f39c0a8468e6c9713622ae2da9ef258deea7b2e4bbf65969c2ba8e08dc9e754f
font_02_sfnt_off0001f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0E6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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