Malicious PDF — malware analysis report

Static analysis result for SHA-256 04df06a5cbb676b2…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 10:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 57c780402f7fd7fee58af3171ce88940 SHA-1: 5f8ea80037e84ad52f71c77ec457e5df6bb3c8df SHA-256: 04df06a5cbb676b24446c901c76a8f0368f3b313e921108c69633e92ddb2768d
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying it as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Diablo 2' and 'rune upgrades', likely a lure to entice users to click the malicious link. The presence of many PDF links and the ML classifier's high score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/strik?utm_term=diablo+2+horadric+cube+rune+upgrades In PDF document text
    • http://geponimodenebev.22web.org/kowemimemarelivit.pdfIn PDF document text
    • http://halfraire.xyz/how_do_you_set_the_time_on_a_onn_digital_clock_radio5e094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_5fd7d1b40b814.pdfIn PDF document text
    • http://private-channel.site/i_ready_7th_grade_math_book_answersapy1d.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/8hdySjd/okay_thank_you_so_much_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/bqyjbth/fikitutitepizoxegex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fc6a80f62185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fe27d8c57ead.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/vuliwisuwig/chernobyl_hbo_dublado_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/how_to_update_autocad_lt_2020.pdfIn PDF document text
    • http://xigakixu.epizy.com/az_900_exam_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/abhimaan_jeet_bengali_full_movie.pdfIn PDF document text
    • http://jaliwevibodipi.rf.gd/benguet_history.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_63b401694fe343acb2de0d1c3a99c7db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/which_john_grisham_novels_have_been_made_into_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/how_do_i_import_a_keynote_into_imovie_on_ipad.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_ae9a6329379c4f2ab78f8dfc64c9992d.pdf?index=trueIn PDF document text
    • http://kololujes.rf.gd/ethics_integrity_and_aptitude_book_in_hindi_download.pdfIn PDF document text
    • http://nomekerileme.epizy.com/schengen_visa_application_form_france_jeddah.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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 5604 bytes
SHA-256: 95a5e5303bd3a7cb7e273f23bdc8e16fe82d5aa110f7fdf8349d697115b3333c
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11024 bytes
SHA-256: 38fc0f2c3b5bfa4cd7f963eac967b6d49f6e2747fbb01d6d33099d46c1d0051f

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