Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee572d80d3ef7f72…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 19:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 141501551b83c25156f87419118e33df SHA-1: b170fcffb115cd78faa06697cbc7dd42ea947c9e SHA-256: ee572d80d3ef7f72022df1eb61b0a0b9a39433a297f542e820b8bd5ffcd7eb31
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF SEO link farm. The primary malicious URL observed is https://kuzutuzo.ru/strik. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious websites or to manipulate search engine rankings. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=what+years+did+honda+have+bad+transmissions
    • https://cdn-cms.f-static.net/uploads/4481518/normal_605dba8d86feb.pdf
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/297116f9e.pdf
    • https://cdn-cms.f-static.net/uploads/4486969/normal_60106ae7a1993.pdf
    • https://cdn-cms.f-static.net/uploads/4453718/normal_604862a44a325.pdf
    • https://dowanolisedu.weebly.com/uploads/1/3/6/0/136056386/140a0eded98ced.pdf
    • https://cdn-cms.f-static.net/uploads/4458390/normal_5fe712e87020a.pdf
    • https://cdn-cms.f-static.net/uploads/4495685/normal_60498120239a5.pdf
    • https://cdn-cms.f-static.net/uploads/4426072/normal_6016cc1e1d41e.pdf
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/c40c51.pdf
    • https://cdn-cms.f-static.net/uploads/4489992/normal_604dbd0557ea6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6ba8aeaf-31db-4220-bf10-b51f4222cbcd/28498391725.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_a35ce36b1f0f466bbb7918234b106729.pdf?index=true
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_defdd2f349e4463cbe147ef8f86d9e68.pdf?index=true
    • http://xojakejib.epizy.com/bescherelle_verbes_arabes.pdf
    • http://tuwigugu.rf.gd/brain_gym_knjiga.pdf
    • http://mubaviz.epizy.com/la_cumparsita_sheet_music_accordion.pdf
    • https://uploads.strikinglycdn.com/files/7d6023b0-6780-4c51-9463-8d82a1548ae9/what_is_huckleberry_finns_personality.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_27516ffdfba240ed9251706dfa8afec9.pdf?index=true
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_61d655d86f0d402886c48e864b0c9c49.pdf?index=true
    • 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_off0000e72f.bin
1ddecd0592f8613caf78b7395e0d16417faabe5d64a61a10d9fd26275dc3a9bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5136 bytes
font_01_sfnt_off0000f887.bin
992c1e4be2cebf51369c9cf7d71e2c6975e493a053771a7af15d73679145bb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10660 bytes
font_02_sfnt_off00011d17.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 4324 bytes

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