Malicious PDF — malware analysis report

Static analysis result for SHA-256 1226d5aaf882b927…

MALICIOUS

PDF

72.8 KB Created: 2021-04-01 00:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c471a5f3356085ca6488f5a68f72c4a SHA-1: 7767bb817eda06134c6c0f4e4927044a401d9e59 SHA-256: 1226d5aaf882b927f1fcc125adb3adaa5ed5ae5a50b0e74ef91d285d7d3792ff
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://dafemum.ru/wix?keyword=tomart%2527s+price+guide+to+hot+wheels+7th+edition
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/3586041.pdf
    • https://cdn.sqhk.co/jefutubup/gajghe4/bubble_shooter_puzzle_bobble.pdf
    • https://sorebupewuf.weebly.com/uploads/1/3/4/4/134447244/d80740458.pdf
    • https://cdn-cms.f-static.net/uploads/4416665/normal_604a973f6f368.pdf
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/povalir-mejinogat.pdf
    • http://ruregere.sportsontheweb.net/entrepreneurship_creativity_and_innovation.pdf
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/9194df36b5d.pdf
    • https://cdn.sqhk.co/bekutojeke/geIhcgc/zobejepejufakajix.pdf
    • https://cdn-cms.f-static.net/uploads/4494875/normal_60601a1815dd8.pdf
    • https://static.s123-cdn-static.com/uploads/4408875/normal_6008cf593c788.pdf
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6011736e4fc68.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_6043b8fc86081.pdf
    • https://cdn-cms.f-static.net/uploads/4485695/normal_601b9a9fe3140.pdf
    • https://cdn.sqhk.co/purilusevike/icjaEhg/pabobaletutukisegopejak.pdf
    • http://nitesufi.sportsontheweb.net/90929283130.pdf
    • https://static.s123-cdn-static.com/uploads/4476954/normal_60047c10434ee.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/32a86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_a540fb472526473bb425a510a5d2963b.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_eb446e9a1d2b47bc9bf2a47b9020d4cd.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_1321c9fcdfee4175aa4047976a62d004.pdf?index=true
    • http://mikijanux.atwebpages.com/celebrate_recovery_step_study_book_2.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_off0000dc32.bin
76a6b5eb1f2dcd001a7471fb90185380ba75962158ec11dae97f8ecb320f85f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 5640 bytes
font_01_sfnt_off0000ef4d.bin
778a656471f7b669175be71bf1dc64487e61e7b326aad041d93298f33f427c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 11228 bytes

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