Malicious PDF — malware analysis report

Static analysis result for SHA-256 2011ca0e8a0e0bbc…

MALICIOUS

PDF

75.5 KB Created: 2021-05-12 17:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1a869f787e7634fbc216bf17ad1887a SHA-1: 7f1987241cdc4477f21b774d70edac1f69753504 SHA-256: 2011ca0e8a0e0bbcc462d76cb20363460022bdda0f4020e556453c456ab4db76
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one pointing to a suspicious domain ('druttle.ru') that is likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/strik?utm_term=interior+design+course+best+colleges+in+delhi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402478/normal_6016b5a457160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_6016cfee4ce42.pdfIn PDF document text
    • https://ganafotereko.weebly.com/uploads/1/3/1/1/131164127/7363174.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/1730608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5fe8487b2180a.pdfIn PDF document text
    • http://subotufo.22web.org/96161811546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36852f63-7790-4e56-b7a8-bce4168d4890/wepolitejaziwetedowifikin.pdfIn PDF document text
    • http://gosonuvubunevo.epizy.com/bipolar_treatment_plan.pdfIn PDF document text
    • http://gakupoxefale.epizy.com/xamarin_android_biometricprompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5feb54a2-9696-4ae4-a402-aa51bc5a5adf/is_sheep_lucky_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/87955302614.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/ielts_writing_task_1_gt_sample_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d305cd-8ecc-444e-ac99-03439735fae3/17485314007.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5068 bytes
SHA-256: 5bb314628c79da85b4359cf4926086c4923967bd74a5de16fe9ceac6b8e08b61
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10904 bytes
SHA-256: 2cb6a62f9ba69f64bb96956dd206b974f6a0fd529a8e0d4107bae4338fe2db81

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