Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1deb50959e27329…

MALICIOUS

PDF

82.9 KB Created: 2021-04-06 01:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5c66a7b23ca30bbba5e5aa7801200d5 SHA-1: 93703e073307a43d61f3cb3e9f2475d4198c505f SHA-256: c1deb50959e27329ecf16719d5e22776323909df3fc36b3a3aa7f54cb21445b9
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://vilenefex.ru/123?utm_term=bacon%2527+s+castle+formation', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/123?utm_term=bacon%2527+s+castle+formation
    • http://nncucuucuc.space/94991219615nbgcp.pdf
    • https://cdn.sqhk.co/gixelotopa/CidChgb/virgin_radio_top_40_2020.pdf
    • http://regse.website/37810502989nn9e7.pdf
    • https://cdn.sqhk.co/sakiforivona/Ngdggjj/i_wanna_get_my_nails_done_meme.pdf
    • http://stroymarketmetal.ru/investigacion_cuantitativa_en_psicologia65dsx.pdf
    • https://cdn.sqhk.co/guwuweri/gcifuRL/stickman_hello_stars_2_apk.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn.sqhk.co/vewimidipiv/fUOCejb/clay_pottery_artwork.pdf
    • http://remont-kvartir-otzyvy.moscow/convert_webpage_to_on_ipadlrppn.pdf
    • https://cdn.sqhk.co/raxipopu/ggwkGDA/81071267756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1a638b03-2659-4e1f-a542-324ede8bff0b/mebefodij.pdf
    • https://uploads.strikinglycdn.com/files/cf6a87f4-119c-4d73-ab6c-756beffe6c33/daguduzaguwajimukejasetal.pdf
    • https://uploads.strikinglycdn.com/files/0bb84e32-7ec3-4eec-b993-12539de545fd/tasewarugafojogotutariso.pdf
    • https://uploads.strikinglycdn.com/files/dbcbdb41-7842-4c3b-b0e1-eac86a0147d4/resistance_training_exercises_with_weights.pdf
    • https://uploads.strikinglycdn.com/files/730abdf0-138a-48d0-a47b-a6d9b9431db6/3083870002.pdf
    • https://uploads.strikinglycdn.com/files/c1a0c498-2b14-40ce-b797-e68173f074e8/best_netflix_shows_like_altered_carbon.pdf
    • https://uploads.strikinglycdn.com/files/6091f03c-a90f-4bbb-96cd-802a5b1a4eb0/leasehold_what_happens_after_99_years.pdf
    • https://uploads.strikinglycdn.com/files/130a67cd-6d86-4354-bfb1-3649e0b987f1/how_to_change_9_volt_battery_on_first_alert_smoke_and_carbon_monoxide_alarm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b8.bin
482a95e5656951ae9d181b068c4b6cce5db6e5375514ae0d9a4806e4fbc6d8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 4900 bytes
font_01_sfnt_off00010938.bin
d36a89ecd95f89fa49147587997a7e3132a2040a19c7c3af514d0250ddf9b0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 11056 bytes
font_02_sfnt_off00012ef1.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 4324 bytes

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