Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dc36ee171244b9…

MALICIOUS

PDF

75.2 KB Created: 2021-04-01 08:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16d476e98ae79c1452b707cf52cc54e7 SHA-1: 1058c3edf079bf54db1b487dca24494e64ecbaab SHA-256: 81dc36ee171244b9b960951c2358ff262103708abb60b2c8b0f9af85a31016f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/award?keyword=solar+battery+charging+system+pdf PDF link annotation
    • http://patewukezevo.iblogger.org/62587667381.pdfIn PDF document text
    • http://waratepesemur.iblogger.org/can_you_self_study_ccna_exam.pdfIn PDF document text
    • http://bitawulam.iblogger.org/solving_linear_equations_cross_multiply_worksheet_answers.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/how_did_europe_recover_after_ww2.pdfIn PDF document text
    • http://xutarima.22web.org/outline_for_argumentative_essay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujabezemaluwe.rf.gd/muwekitoliw.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/97425634164.pdfIn PDF document text
    • http://sokurunofizune.rf.gd/kigelilasagaxoririjona.pdfIn PDF document text
    • http://tavuvije.epizy.com/senior_class_president_speech_graduation.pdfIn PDF document text
    • http://kiderirujefadag.epizy.com/what_is_sociology_class_about.pdfIn PDF document text
    • http://dukejujegu.epizy.com/32884884172.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/how_to_fix_a_window_air_conditioner_compressor.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/binudisave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f48677b-e096-4d62-90fc-fabadf4e0640/what_is_a_speech_preparation_outline.pdfIn PDF document text
    • http://fuvimexapa.rf.gd/49355553993.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/76228001346.pdfIn PDF document text
    • http://gegokuberil.rf.gd/nobuluvurifexesu.pdfIn PDF document text
    • http://vidavimutisov.epizy.com/reduced_relative_clauses_worksheet.pdfIn PDF document text
    • http://fegozovot.rf.gd/42559499963.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/65027234296.pdfIn PDF document text
    • http://pofizobeje.epizy.com/rowojeti.pdfIn PDF document text
    • http://dawifugoxumevej.rf.gd/dirt_devil_vacuum_reviews_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511fa656-bef6-49de-a3ca-0f9950eaec9f/99395793102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1208da6-7679-4c4d-80fd-4edabcfb81fd/how_much_does_sketchup_pro_cost_for_students.pdfIn PDF document text
    • http://sukorijemitij.epizy.com/algebra_y_trigonometria_addison_wesley.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5912 bytes
SHA-256: b86e5797031b4e37c03194816230292a2496b1389159902ee91816e6b5d4e8e5
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10884 bytes
SHA-256: 821daee7a09f76548ebdbd754d61d0394a002fa0bf5cc7df9391774d066d6a80

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