Malicious PDF — malware analysis report

Static analysis result for SHA-256 1959127ae4cdd332…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 13:00:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f2562d799082811a0a0ba7372fae5698 SHA-1: 5fb2925f470d9d10b48b5dd3d240c3545ac4ec19 SHA-256: 1959127ae4cdd3327a2e4f997a1d8f0789bb7088e15638dc1acbad4613b6764b
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 or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://druttle.ru/123?utm_term=ice+cream+cake+red+velvet+piano+sheet PDF link annotation
    • http://xitodefigatefuj.medianewsonline.com/46336136706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_60244e555a5ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_602d39b07be34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd2d2250bc93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5ff54f0aeda34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6028e6005df09.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/15078173559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6042c8f9e4314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fe97dc3bf050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_600ce66cc3cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5fec27af32485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fca84cc2de90.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/19224213501.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/echo_pb_250_hard_to_start.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_6031ff6069e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_603aa3d4aa34e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/how_many_calories_in_a_chicken_taco_salad_from_taco_bell.pdfIn PDF document text
    • http://kagijido.myartsonline.com/vibevowakozano.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_5d42ac39e63a41bd9fe635b67b89a5d8.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_2752ff2cf746432abf4eb8c5a6ae25d8.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_308e7ac093934adc8cbfc3355ed0fe72.pdf?index=trueIn PDF document text
    • http://woxikajir.myartsonline.com/11192319179.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 5372 bytes
SHA-256: d551563329d4888bab651ec0dc9b0debcbc84f29f06fc1a51ec1e1d69032ff56
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10952 bytes
SHA-256: 34bf89dd162c0402640b7649033822aca9b89b7f09feb4e680d2e2419bccc6bb