Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ecbe4f609858df…

MALICIOUS

PDF

83.1 KB Created: 2021-04-14 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 37f6d3485fff3dd9c21c37ff99156b94 SHA-1: b0cabfeb05674f58b4a5cc1acef8f1a7a4f1b918 SHA-256: 61ecbe4f609858df6e93aa5e566ec59c224ea021574e82e33cac41d32b56cab0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent.

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://lozipotod.ru/strik?utm_term=4+pics+1+word+level+2371+answer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448545/normal_5ffbe5d93fc50.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/27390937720.pdfIn PDF document text
    • http://gedagefi.22web.org/jira_assignee_history_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd82ae52f8e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fca668a29808.pdfIn PDF document text
    • http://navelina.iblogger.org/pegezekeril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fe656d3590c2.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/76135437688.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/metabolismo_de_las_bacterias.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5fec336b4f848.pdfIn PDF document text
    • http://vugiris.22web.org/bionic_turtle_frm_videos_free.pdfIn PDF document text
    • http://bovizanaranofo.22web.org/twilight_saga_eclipse_movie_download_in_hindi_dubbed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fe6aa8eae315.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/siwokawitututirapir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepibatavike.rf.gd/33734918773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26abed1-da0f-4f1a-b18a-9bbfb39efe5e/36328208253.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/b_pharm_syllabus_2020_aktu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c11344c-8aae-4304-9652-f6fd88d381e2/geometry_module_2_lesson_2.pdfIn PDF document text
    • http://rowagaparik.rf.gd/darewilavusifiniritiruvaw.pdfIn PDF document text
    • http://divonuniset.epizy.com/tetrads_form_and_crossing_over_occurs.pdfIn PDF document text
    • http://vipebajivakal.epizy.com/free_editable_family_tree_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b41287d-289b-48c6-9532-2eaebcd644ca/vuravu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ae5727-1228-4720-9632-85317fd2a2bb/american_popular_music_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f9e05b-eb31-483e-b8a7-2e5e54c9a027/log_cabin_description.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5640 bytes
SHA-256: 086a422665848e602f4b6731a6ff848900832e2b2673cda484dd7fde320490ac
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 10564 bytes
SHA-256: 24b9b7a38b1c0ce27c1f8b0c9875869b837405b8a777663cfea277c2a04f9643
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16196 bytes
SHA-256: a9049e2740f28e07ceae22d5f1e2fc0df0884d12edefc4f119790aeee9b14a88