Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd081affc3a95f…

MALICIOUS

PDF

74.6 KB Created: 2021-03-27 14:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d66d047eb36fbd371415db1d565a4ffe SHA-1: 5feee3235aa3185638cc2395f1edc89947bdb960 SHA-256: 12dd081affc3a95f5800d429b8295806af29afa921eac0df94951c3536773aa2
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains an embedded URI pointing to 'vilenefex.ru', suggesting it is designed to redirect users to a potentially harmful website. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search, reinforcing the lure of a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/award?keyword=responsibilities+of+human+resource+management+pdf
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fcb21b862e65.pdf
    • http://topdouche.xyz/mathematics_94_answersw7rw5.pdf
    • https://cdn.sqhk.co/nobipajami/ixcieaV/weather_radar_florida_live.pdf
    • http://lestyprin.online/jowitexudexarozeliwirorumq928c.pdf
    • https://cdn.sqhk.co/rizinutix/S6Az3hj/54087766967.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6029fb54a51d1.pdf
    • https://cdn.sqhk.co/wotinobeb/jG55icr/funny_happy_easter_gif_2020.pdf
    • http://lightstart.xyz/8485256750001yu8.pdf
    • https://cdn.sqhk.co/wukatigubo/Hieojjf/craigslist_mansfield_ohio_furniture_for_sale_by_owner.pdf
    • https://static.s123-cdn-static.com/uploads/4492600/normal_6007c8c151f24.pdf
    • https://cdn.sqhk.co/jivazufevi/cjiqjCh/guided_reading_activity_27-_3_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6058956d4e48b.pdf
    • https://cdn.sqhk.co/geruxibab/ejfiege/tugabogogegewemevijebila.pdf
    • https://cdn.sqhk.co/lovuzegonu/ddchahj/krome_studio_plus_app.pdf
    • http://rfs.team/factores_bioticos_y_abioticos_de_un_ecosistemafe1il.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0df03931-a9e5-45bc-aab8-ee84bfe72352/e93839_motherboard_ram.pdf
    • https://uploads.strikinglycdn.com/files/78e74c10-2919-4f96-9e94-881ebd0688c5/wobekuxejefer.pdf
    • https://uploads.strikinglycdn.com/files/bedff1bc-40e5-4c02-ab70-cd74d8507666/john_deere_425_mower_deck_belt.pdf
    • https://uploads.strikinglycdn.com/files/337afb66-c5cc-49bd-b870-437ebb793a8e/where_is_account_preferences_in_settings.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_off0000e47f.bin
061acd9b1d0c52bc38db4b9a62d436f09f457790aec646729e351ec0e53ae157
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 5716 bytes
font_01_sfnt_off0000f7c0.bin
9c4e2af93a41e34dd524ba12b1b43c5668757e6308b6ebd3c3f264ab86f48319
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 10848 bytes