Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4dea4707e61b3f…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 16:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 110af8ed5544b4e20a1d1d9609bfd212 SHA-1: 691a080cfa81adb00b924b99ba0b7de1f4749d1d SHA-256: 6d4dea4707e61b3fd10e8c8352c8ee8988b889bc9c02e03f19bdb0e8118faa80
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded URLs pointing to suspicious domains. The PDF structure and heuristics suggest it's designed to exploit users by directing them to external resources, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=biochemical+genetics+pdf PDF link annotation
    • http://mivolamuzimapu.22web.org/55979301967.pdfIn PDF document text
    • http://rakukoke.22web.org/wifedesofugi.pdfIn PDF document text
    • http://sakipewo.22web.org/2d_discrete_wavelet_transform_matlab_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipinasin.epizy.com/16154275622.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/26598522722.pdfIn PDF document text
    • http://molodetagako.epizy.com/the_game_rapper_hit_songs.pdfIn PDF document text
    • http://wigazimo.epizy.com/aap_guidelines_for_treatment_of_hyperbilirubinemia.pdfIn PDF document text
    • http://walexesanub.rf.gd/what_is_the_shortcut_key_for_screen_recording_in_windows_10.pdfIn PDF document text
    • http://jefeduwikiw.epizy.com/bangla_language_keyboard_free.pdfIn PDF document text
    • http://xenivut.epizy.com/what_is_architecture_of_data_warehouse.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/89405395715.pdfIn PDF document text
    • http://kakoxoduruze.epizy.com/windows_10_bootable_usb_file_format.pdfIn PDF document text
    • http://nekedejiwaki.epizy.com/93089651227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727f74b6-34fc-4081-b341-a2b05c58de1f/88893130404.pdfIn PDF document text
    • http://wikusonusi.rf.gd/74079607256.pdfIn PDF document text
    • http://kozifina.epizy.com/94033055417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdb7b99-be3e-4c13-92a2-b0b4b036cd02/english_grammar_quiz_for_class_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2082b1fb-dde5-47b1-b008-cfb3955d174f/ncert_solutions_of_organic_chemistry_class_11.pdfIn PDF document text
    • http://xoxejafomi.rf.gd/60326269903.pdfIn PDF document text
    • http://deweleve.epizy.com/animal_farm_cartoon_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/big_book_reading_comprehension_compilation.pdfIn PDF document text
    • http://balazetesu.epizy.com/37277070181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddea1f0-7b03-4153-a575-db0849adb1df/pijotozuwomak.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 5524 bytes
SHA-256: f6eba6f1e5f8be0d97396402e6d6ed08afac4f4caa95a90772ff27e553c801f9
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 10496 bytes
SHA-256: c44a1c343b844ae5849121beb80e329b43430a34d36e9a6d00100cd5e4afa800

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