Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d908feebc60bf9…

MALICIOUS

PDF

81.0 KB Created: 2021-05-24 06:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af564e46328a213dc5b67e79e86d4d65 SHA-1: 83ef25e36a9cd3fc4a63fc9dc6347c3d7a400375 SHA-256: d0d908feebc60bf91850936bd75a8f82b78b6a085f0b7c42742effc8e4876e22
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to external websites, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The primary URL, https://jumiwimov.ru/strik, is likely the destination for a phishing or malware download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=what+is+fleming%25E2%2580%2599s+left-hand+rule+used+for
    • https://cdn-cms.f-static.net/uploads/4408340/normal_602a4527be50f.pdf
    • https://static.s123-cdn-static.com/uploads/4446931/normal_5ff0679890fb5.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_60262faeb5763.pdf
    • https://lujumibuxoze.weebly.com/uploads/1/3/5/3/135350241/aa388a08.pdf
    • https://makemugajisere.weebly.com/uploads/1/3/5/3/135317455/sumukit.pdf
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/44266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7af7ad72-707e-4817-a143-eae4fc850147/19912990528.pdf
    • https://s3.amazonaws.com/pevarijidasalop/52063151317.pdf
    • https://uploads.strikinglycdn.com/files/d28635d2-151b-4641-9b6e-450aeb9261d0/88392650460.pdf
    • https://uploads.strikinglycdn.com/files/44f7395b-49e8-4d84-8ef0-50fbbb73cf3a/7196027965.pdf
    • https://s3.amazonaws.com/tanikanaw/best_cheap_android_phones_reddit.pdf
    • https://uploads.strikinglycdn.com/files/f9bc5d9a-1dfb-402b-8b7b-a33f6cf3949a/how_to_save_garageband_as_mp3.pdf
    • https://uploads.strikinglycdn.com/files/cc0720e2-8ec5-4ed1-a51e-db4e048ba298/biochemistry_textbook_lehninger.pdf
    • https://uploads.strikinglycdn.com/files/08462ddd-7253-49b7-95f9-1d617ded348b/jp_morgan_chase_bank_head_office_address.pdf
    • https://uploads.strikinglycdn.com/files/888b8174-c554-47e2-8403-4b94b7414e86/51286719679.pdf
    • https://s3.amazonaws.com/roware/76953252448.pdf
    • https://uploads.strikinglycdn.com/files/1f26f5fa-3399-4dfb-82e6-5af0d7ffc50e/23613616241.pdf
    • https://uploads.strikinglycdn.com/files/74c26be7-97ee-45a2-9c73-fa73f088c5e8/big_fish_casino_friend_code_example.pdf
    • https://uploads.strikinglycdn.com/files/25742549-0b99-4220-ba54-41848535a3c6/wutizidopemugegagurus.pdf
    • https://uploads.strikinglycdn.com/files/d277fc25-2a3d-488b-afd8-061b2a992cdc/how_to_get_business_loan_in_indian_bank.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_off0000f9a5.bin
ee2d9763f693485c117163db26385560de14ebaa2cf134a1b142349dc6c18d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 5416 bytes
font_01_sfnt_off00010c08.bin
66a8c9f943a3abd149d7eb3e8c33196e504516ec4c6d4ea9ace40e02fd9658af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 12100 bytes

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