Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6834493558f570f…

MALICIOUS

PDF

101.4 KB Created: 2021-04-22 01:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb23de7a787c89ab04e633ecae24ed3c SHA-1: 21d74d443d4adf21c68b8b76b3f82725295094ac SHA-256: f6834493558f570f05802fe457e6f7ddb04f08aa59648ec931493c12c8b97856
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which are associated with disposable hosting and redirectors, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, likely to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=english+conversation+practice+by+grant+taylor+pdf+online
    • https://xenonomexe.weebly.com/uploads/1/3/5/3/135386884/xotitebozavebu-ruliwatalufuro-fawenoze-zetoz.pdf
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5fde92b13068b.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_60396d256e419.pdf
    • http://fabulouss.space/559048604176vu9b.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fd6a98a66e3d.pdf
    • https://wapixetisabin.weebly.com/uploads/1/3/4/6/134685373/146c1aa6ba9ee0.pdf
    • http://favarivizuna.medianewsonline.com/promissory_note_telugu.pdf
    • https://cdn.sqhk.co/libavesonon/hgjeChd/ranarotunifabidavo.pdf
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/855ac69a45585eb.pdf
    • https://cdn.sqhk.co/makekajet/CqCRhes/93493899596.pdf
    • http://bobr.space/learn_python_programming_by_making_a_gamewevsw.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/8896699.pdf
    • https://cdn.sqhk.co/mozedizupi/jMgfhc0/custom_text_message_sound_android.pdf
    • https://cdn.sqhk.co/sobetevod/ggOig45/fenisa.pdf
    • https://cdn.sqhk.co/fapewejav/ggjjjdp/raselafalerelejo.pdf
    • http://vemelaribox.getenjoyment.net/a_wrinkle_in_time_chapter_6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1bb43706-94c0-44ea-92ad-8934b752e28e/gapofubajexop.pdf
    • https://uploads.strikinglycdn.com/files/282f3203-8d98-404d-8ae9-75c18b84679d/37152798135.pdf
    • https://uploads.strikinglycdn.com/files/8830c8b7-e79a-4331-86ae-75d894180486/47613984269.pdf
    • https://uploads.strikinglycdn.com/files/8d422463-320a-4eb1-af2d-85b4e91ba56c/learn_unix_the_hard_way.pdf
    • http://sojusenetuki.onlinewebshop.net/bonolota_sen_poem_download.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_off00013fb1.bin
829808de31a8e3069777066e4506a8570a3d22c0070a5fc5c030efd8fc0b5438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 5464 bytes
font_01_sfnt_off00015243.bin
7311ae7cd536c7c4ec5afa46d206d3b0b26e3b59024402950f03d9f7a9729250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15243 11344 bytes
font_02_sfnt_off000178cd.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178CD 4324 bytes

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