Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5e8526ce296955…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 00:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9070aba21627f3fa08fe709726d0851a SHA-1: 774b854a1b0d1ac9becac7d3cec6dc6f786bed62 SHA-256: 9f5e8526ce296955adc230dbb1b62117dbaf313b7f0826d75ec82533ee2658af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://jumiwimov.ru/123?utm_term=asge+guidelines+capnography
    • http://housefashion.ru/sogozopaxuditopipelabd7ya5.pdf
    • http://carishr.com/how_to_make_a_healthy_salad_to_lose_weightwpi6n.pdf
    • http://tuduvodakep.mypressonline.com/alan_moore_watchmen_download.pdf
    • https://cdn.sqhk.co/bisadidizi/hjxXBrj/18316217790.pdf
    • http://instapriz.online/what_is_the_best_hvlp_paint_gunbfutq.pdf
    • http://fisujerekuvij.getenjoyment.net/juwigokiwexe.pdf
    • http://lighttravel-ng.com/lipebimulefavajebagei6lh.pdf
    • http://50offstore.info/xegesikagabavabaua8ep.pdf
    • https://cdn.sqhk.co/fegibowaxus/BicibKD/color_road_app.pdf
    • https://cdn.sqhk.co/pogezasamu/g8W3Mhb/94452747331.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_d2eb39a14e1a44c195bbf2ea8540df41.pdf?index=true
    • http://jemukiguwuw.myartsonline.com/electronics_engineering_notes.pdf
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_1d224381a53942deb433d51861fcdf04.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_72c183941e064e44adad4ba879e9549a.pdf?index=true
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_7248c58bf38c4707baf0c941a3db6c7e.pdf?index=true
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_e2675c352f994c42a51ad32df6eeda01.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_9ba20cf014464fee9bf7274de60b6409.pdf?index=true
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_b3f98cca5f1b454c883b5a9e5258d63f.pdf?index=true
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_2053cee34ed344f3bbfab35e63ae5152.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_ee3cdbfa39584b95b0618a0774c51dac.pdf?index=true
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_ba08a13d5f904c9082a99b944d627d69.pdf?index=true
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_4cea313d1bcd42cdb52a01ce0a48e99e.pdf?index=true
    • https://6b5b785e-7b82-4933-a6c8-7bd064122b77.filesusr.com/ugd/a9248e_48916a52fe8740538a31322616ea2f8a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin
ea90cd7832e3960fb0275572ee8b07e9b13be7850cffe40786101555eb71e01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5428 bytes
font_01_sfnt_off0000fe69.bin
b61b4482b9b9eab5678087120b02af1a32ef271f00dce5be98bb7e4e4ca80d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10944 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.