Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fbdd7544f2db5c…

MALICIOUS

PDF

70.6 KB Created: 2021-04-01 17:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8c45f3689e36015e7b7e2f128a6b74d8 SHA-1: aef0980fd4a30b49aa7f273f7b26d7f2d376f935 SHA-256: d4fbdd7544f2db5c13097ac444fc9b289e0552f37e58aa07addc71307b16fb3d
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to search result content, further supporting the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=logique+de+l+argumentation+pierre+blackburn+pdf PDF link annotation
    • http://hookup668.site/orbit_battery_operated_sprinkler_timer_with_valvek99em.pdfIn PDF document text
    • http://lovelyhouse.online/dork_diaries_10_full_bookmk5u6.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/amana_american_fridge_freezer_manual.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/islamic_banking_and_finance_mcqs.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/carpentry_tools.pdfIn PDF document text
    • http://wanebori.22web.org/halogenation_of_benzene_mechanism.pdfIn PDF document text
    • http://totalcreditcheck.info/how_to_start_a_honda_gcv160_pressure_washerjjoot.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/93820128134.pdfIn PDF document text
    • http://lasofetuxig.22web.org/bupugene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/suximawo/dell_emc_vxrail_e_series_datasheet.pdfIn PDF document text
    • http://tubiruk.epizy.com/learn_ordinal_numbers_in_english.pdfIn PDF document text
    • http://dasopikabuma.rf.gd/pupukoxewujatafid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3add13-3fa4-4af5-ab0c-9e9f28d087b3/kala_journal_of_indian_art_history_congress_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd51b8d-1eb5-4930-8b7a-eea302a6042f/cinderella_play_script_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/22568082365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a5163e-673c-4de5-b883-baf2552545ed/descriptive_writing_examples_for_kids.pdfIn PDF document text
    • http://kebowikosu.epizy.com/refizovusavapumoziwos.pdfIn PDF document text
    • http://filujade.epizy.com/aura_kingdom_mobile_class_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 5448 bytes
SHA-256: b33739d20c344f8a251db16b7dc47acb3142faa644db07e5dab5c4121b4fcba8
font_01_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 10312 bytes
SHA-256: d44ff70e9f46d93347c0afe0eb885c99505c59ce4478b6b4bd946a269b1345a4
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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