Malicious PDF — malware analysis report

Static analysis result for SHA-256 5796d9748137f0b4…

MALICIOUS

PDF

82.0 KB Created: 2021-05-08 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c375a803f5fdfe947e22bd6f57f8241b SHA-1: 44c042ff77ddb32b63d81b80b29063471748303a SHA-256: 5796d9748137f0b40fafb7ce8919ee7487adff315886d9b137e932e5836175f5
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 are dynamically generated, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used to redirect users to a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pelibifir.ru/strik?utm_term=bissell+proheat+pet+89108+parts
    • https://fadurobudafeme.weebly.com/uploads/1/3/5/9/135959894/2069573.pdf
    • http://dekabizutetan.22web.org/how_to_rig_for_flounder_fishing.pdf
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/fitebik_fugurekig_zibemuvu_kovepejesetegi.pdf
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/8788077.pdf
    • http://jitokinut.iblogger.org/craftsman_pyt_9000_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_2b8cd919d58b45dba0df5f0eb80e5ce7.pdf?index=true
    • http://zezevefo.rf.gd/visual_basic_6.0_software_free_download_for_windows_7.pdf
    • http://velevemi.epizy.com/jozukeramomejorilasux.pdf
    • http://lajirobodogew.epizy.com/functionalist_theory_of_development.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_26c469e2184045d5ad058ebb89adf02f.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_8dcb446ae09d41e89630a81cfbe8d2c0.pdf?index=true
    • https://7fd9f749-07b0-48f8-ad51-68075edef824.filesusr.com/ugd/197648_b64337e0e69e4a68b17bf414ced04665.pdf?index=true
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_fc60c17705324dda86474d6a71e896dd.pdf?index=true
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_b97e22d8883b4deda7aa9912234912ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d9721c9-bde8-452c-a367-2fab52a30f54/81469001630.pdf
    • https://uploads.strikinglycdn.com/files/4e09885a-b717-45ba-a25b-7e7ac7d83619/how_to_learn_korean_alphabet_for_beginners.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_c38187eb7a134d92aa4285b8fbe7e71f.pdf?index=true
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_5649111175b14895a849232828922a18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90283004-e07c-4b91-b4ce-64e2412b4e1b/graphic_design_salary_in_mumbai.pdf
    • http://dudolisimak.epizy.com/29261678929.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c460894698144d7d91dc2bd70545a074.pdf?index=true
    • http://fapiranug.epizy.com/68407766432.pdf
    • https://uploads.strikinglycdn.com/files/ac31bf7a-edd9-4426-87c7-5d7c1d52f54c/tapozojifipupaju.pdf
    • http://gajovab.epizy.com/48800691368.pdf
    • http://ketugida.rf.gd/16051562537.pdf
    • http://zefuxaninegug.epizy.com/69286532775.pdf
    • https://uploads.strikinglycdn.com/files/2a36ed99-17c5-4d89-b56e-70d39c07a89a/32657945349.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_off000104c5.bin
f082f699cb01848377d3b3d81321f0a58985f76b485c57571ad0b2e0aafeacfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 5500 bytes
font_01_sfnt_off0001176c.bin
be28888d70cbc238624f93a59c94857afbf8affdfc825943e62aeeb9a2dc80d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 10068 bytes

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