Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace431bac881877f…

MALICIOUS

PDF

79.0 KB Created: 2021-04-21 04:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4b26ab5c853f74d2924b9fd0bb2ad9d SHA-1: 69a6dd4c7f719ece31ca6c5862a7b9e0f29264ae SHA-256: ace431bac881877fcaa4dcaab469d5259a50f4a5f628e2c4e52ad349692fcde3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests it could be used to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://ponafet.ru/strik?utm_term=what+kind+of+oil+does+a+subaru+power+washer+use PDF link annotation
    • http://tajavimisafom.22web.org/border_song_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/jm8gfVD/26558559256.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/gijigh0/vunavamifawefanoraneda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_60164ebe8b292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_5fee296fbcf17.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/qegj4jb/wemisixulofugura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_5fcc82630f1eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fce54c3a286b.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/sibewoxarodov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_601244a8bd745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_60342f63ab3f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_15a2a90e6962445585e3353bfa43ea7c.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_40676f6558b04e8090e4105cdaf1a9ed.pdf?index=trueIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_954fd6878e2848af86b1f4f08e705936.pdf?index=trueIn PDF document text
    • http://vuripoda.epizy.com/basic_accounting_concepts_in_marathi.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_71e4a45aad8c43e2921e13276cd058bf.pdf?index=trueIn PDF document text
    • http://xesidif.epizy.com/python_download_files_from_web_directory.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_89f076400c9949b4a82188523576a39b.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_43c6fc3877b442a0b9e27d4a1a6f60dd.pdf?index=trueIn PDF document text
    • http://nulibipegetoko.epizy.com/john_deere_x324_issues.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_87f01ad157194577ae98bbe4d771d720.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_c6e0b337316b45028dc39aa7b5910221.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_48dc936407d04ae0b3a8395bdd6a5656.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 5320 bytes
SHA-256: a166e00761bb888b6dfdb3d04b6fd0613b3a8a870433bb085b0337c2354565af
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 10388 bytes
SHA-256: 12dd13b4d25a253ee7f2bd78487009e1b15e89fdb34c9e4585ca2453e8bc1adc
font_02_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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