Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67ad6ac10aa0aff…

MALICIOUS

PDF

85.6 KB Created: 2021-04-04 21:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ec5b2bc196a8b11144078e6c32817bd2 SHA-1: e53bbaf6ce2ee09b433f59cd7d376fe5a230f22c SHA-256: b67ad6ac10aa0afffb6b5c9b9ee728c9d919a0e8d42432f751bb590902b049ca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm or phishing lure, disguised with a search query for a popular TV show. The presence of these links and the heuristic firings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=skam+italia+season+1+episode+1+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381289/normal_5fda3d2626956.pdfIn PDF document text
    • http://copyright-infringement.business/kemowetapzqltt.pdfIn PDF document text
    • http://lorenbayi.com/volkswagen_beetle_transmission_fluid_flushow5gd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fd661d438d1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fc801fae59db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_6063a642b1d25.pdfIn PDF document text
    • http://xipelosowux.22web.org/union_plumber_salary_oregon.pdfIn PDF document text
    • http://coolstudent.space/54772905277p23z4.pdfIn PDF document text
    • http://natural-shop.info/mozovapetowvqrx2.pdfIn PDF document text
    • http://krokoboko3.xyz/what_do_bad_blood_mean6nr0p.pdfIn PDF document text
    • http://wacc-cat.org/aadhaar_software_for_pcyge9m.pdfIn PDF document text
    • http://lovojat.22web.org/what_is_one_major_effect_of_climate_change_on_food_production.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://soul-felt.com/business_partnership_deed_format_in_banglacfi13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bufexa/godot.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/chapter_2_kinematics_in_one_dimension_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/63035565527.pdfIn PDF document text
    • http://bejuzijufure.rf.gd/harman_pellet_stove_dealers_in_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/film_bridezilla_full_movie.pdfIn PDF document text
    • http://widafasamuj.epizy.com/21674508178.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/nebanazadu.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_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 5408 bytes
SHA-256: 2ae8bf96aa4a8f95ae71c77c7e7af0d9f2e2dcf573c508645c64b17b7d1184ec
font_01_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 13884 bytes
SHA-256: 5211db1ee7d1b0d90c972fcee44d5328d3161ed65c75f474cb8cd0fcac3dd760

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