Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a1a789b16ba3a9…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 18:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b966e2fb08b34c374261e61d10311b62 SHA-1: 99b95eacbeea8e413d11aa28306017de43ae0bd1 SHA-256: 99a1a789b16ba3a99d6a26f569023dc993fd2a96b75fcf21568ab36da442e8c9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=defiant+light+timer+troubleshooting PDF link annotation
    • https://fakedowekiz.weebly.com/uploads/1/3/5/3/135314463/37472.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/jusavax.pdfIn PDF document text
    • http://topsale.pro/anselmo_ralph_musicasvfwue.pdfIn PDF document text
    • http://yazansoft.com/igo_primo_car_navigation_updatek5rx1.pdfIn PDF document text
    • http://moitender.org/lavalantula_parents_guide0re6o.pdfIn PDF document text
    • http://madewithsunshine.com/tuwojikomozunanedijepaxmky3.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/fujudekager.pdfIn PDF document text
    • http://seomagnat1.online/colour-_block_pullover_hoodie_nike_sportswearepmlf.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/60875786959.pdfIn PDF document text
    • http://bigops.fun/lomesunudix5kn6j.pdfIn PDF document text
    • https://menolalosixoj.weebly.com/uploads/1/3/4/7/134714047/8283368.pdfIn PDF document text
    • http://sweetygirl.club/kumumewadarejaduwokikomifi5oj.pdfIn PDF document text
    • http://jamedoxeka.22web.org/thales_hsm_9000_datasheet.pdfIn PDF document text
    • http://deflecfcvy.best/why_would_smoke_detectors_keep_going_offm90h4.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/climb_every_mountain_piano_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegetebipa.atwebpages.com/enterprise_risk_management_adalah.pdfIn PDF document text
    • http://rojurim.epizy.com/kuvuliximotikelajave.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/how_to_stop_first_alert_alarm_from_chirping.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/gituguzojovuvupo.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/expresiones_formales_de_agradecimiento_en_ingles.pdfIn PDF document text
    • http://dimegebewode.epizy.com/android_auto_2._8_apk.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/math_problems_for_5th_grade_with_answers.pdfIn PDF document text
    • http://zerakunutage.epizy.com/nec_article_250.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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 5320 bytes
SHA-256: c5b5caf2c3e83216a9921a1a43f2e5ae374c55074530b4035c7fa8dd1134553e
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10584 bytes
SHA-256: 6e36068cd065e5d0929d42ddc9a808a705d6d6324a99f6ca7f06528e526c6cc0

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