Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d53dd43d5147242…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 19:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20201f0ed00ae449a892d69ed1ed36f SHA-1: 4f546d2823ec4666a8b4c5d78b9ad154e185ab2d SHA-256: 8d53dd43d51472429e245a279b309c665aa9ec105ea19c99329437733c0d8388
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF SEO link farm. The primary URL, https://vilenefex.ru/wix?keyword=skull+front+view, suggests a keyword-driven content generation strategy. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or malware distribution. No scripts were extracted, but the structure strongly suggests a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=skull+front+view
    • https://cdn.sqhk.co/menodotitit/ghjlkhc/brain_test_tricky_puzzle_level_106.pdf
    • https://static.s123-cdn-static.com/uploads/4457272/normal_6003f7d91fc68.pdf
    • https://cdn.sqhk.co/vipikunowi/eQURgda/zilaja.pdf
    • https://cdn.sqhk.co/vozevadijut/7xjachb/strategy_definition_in_management.pdf
    • https://cdn.sqhk.co/komajekolino/iCdgegd/zombicide_black_plague_wulfsburg.pdf
    • https://cdn-cms.f-static.net/uploads/4456728/normal_601a1e915551f.pdf
    • https://cdn.sqhk.co/vulovosovem/eejjI6v/buzzer_buttons_for_dogs.pdf
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5ffdd9c1d1427.pdf
    • https://cdn.sqhk.co/gotulurowav/FaVThaB/torque_lite_obd2_car.pdf
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5ffbf831cb0a2.pdf
    • https://cdn.sqhk.co/jokawefezo/GRhg2Ud/ncert_books_ncert_solutions_download.pdf
    • https://cdn.sqhk.co/gajerivab/jNijNhi/97138462040.pdf
    • https://cdn.sqhk.co/gobajejuz/f0ghfE4/noxijawijajig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0cfa51d-15b1-4f13-b807-a622f913b310/gerelipud.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_15f11d67de1c4044800dcea5c558c946.pdf?index=true
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_b776604779cf48e6a645633c0b7f9160.pdf?index=true
    • http://bojibag.epizy.com/integers_on_number_line_worksheet.pdf
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_1013a578e12d40159b78469524d0f128.pdf?index=true
    • http://josegofubusem.epizy.com/statistical_data_types.pdf
    • https://uploads.strikinglycdn.com/files/893390dc-40ab-4256-9c52-9479eabfb6d9/ryobi_backpack_blower_carburetor_diagram.pdf
    • https://uploads.strikinglycdn.com/files/bcb2d0d9-20b2-4841-971a-76aedd098bb5/an_advantage_of_real_estate_investments_includes_all_except_what.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_1745437d445f4a4689503ddb7ca673c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/106fa4cb-657d-4ce2-88d7-d0ed2690dc3f/timex_alarm_clock_t121.pdf
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_908348c913e34ab3a85d632287302ea6.pdf?index=true
    • http://sodarag.epizy.com/christ_church_school_lucknow_admission_form.pdf
    • http://tunazafagid.epizy.com/33060725539.pdf
    • https://uploads.strikinglycdn.com/files/f7342602-5f30-4948-a225-59541d19d69d/how_to_pass_the_vision_test_at_the_california_dmv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeef.bin
3791f9169f543ac9dab7a601b9d44b4d24e74de9a5fefc7393e9bb9d4e659566		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 4692 bytes
font_01_sfnt_off0000ff11.bin
70ceedcc33116543c23b54947859d17362b3a1a68976a70c13e87e5d2ac6cc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10468 bytes

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