Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5771d31230801f…

MALICIOUS

PDF

92.1 KB Created: 2021-02-28 19:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 023775228ab042c7484b898c1f49b8d4 SHA-1: 2be5f0955d9e1108fc90bd90b2afaa7950a153ff SHA-256: ce5771d31230801f7920e67153de23c4e8e33183b72499ae288da439e1c41c38
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary lure appears to be 'adblock browser beta apk', directing users to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/wix?keyword=adblock+browser+beta+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464871/normal_602548d394de7.pdfIn PDF document text
    • http://good-production9.site/25030552548l1pxf.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/venstar_t2900_blank_screen.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/kigijidikik_vipevilodom.pdfIn PDF document text
    • http://bt-management.website/1926264752210ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_6022e8610026d.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/audio_driver_for_windows_10_dell_inspiron_15_3000_seriesfdcin.pdfIn PDF document text
    • https://tenadugal.weebly.com/uploads/1/3/2/7/132740541/9a6e3ddd2d559.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/a3hboja/capsule_pharmacy_nyc.pdfIn PDF document text
    • http://zuxagomuzog.iblogger.org/31444166114.pdfIn PDF document text
    • https://cdn.sqhk.co/fusevesapime/0geicjh/best_free_video_creating_app_for_android.pdfIn PDF document text
    • http://nextauto02.ru/84841536079e9fm9.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/gowirejopigoken-berenufiwitidew-risovuvega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fc6579bb37e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_600135c2e0afd.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/how_to_remove_pimple_marks_at_home_in_hindi.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/f8e0ed3c8d40418.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://siwojanapav.epizy.com/california_critical_thinking_skills_test_questions.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/53307162876.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/4942880619.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 4988 bytes
SHA-256: 6bbe6a482334dd96d14d5105be1e2cd88229b8d019821cab08f7575c06a2236e
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 7300 bytes
SHA-256: e7d80cc98b280bbcf68e60808e0b6cb6ad83c835801d31f69c61883d187f7128
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 10696 bytes
SHA-256: 910e379bace505d8a307b89dfbcaacf8b90d1fdf88c0d341a9a8eec32be6d025
font_03_sfnt_off00013e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3C 16328 bytes
SHA-256: 68fb388c6b89fa332810f41b5bb86928254c5d182ee1207b277fc27fe5f5d1eb
font_04_sfnt_off000153f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c