Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba0ce9948d51ed1…

MALICIOUS

PDF

87.7 KB Created: 2021-04-21 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4fe50b86f01e737c5e35694f3eae9ac SHA-1: d08a2a08ce22baa5e9963c53747888196e6ea215 SHA-256: 9ba0ce9948d51ed1b1745e1736e15982f476aead549cbd652130561562c51dcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a strong likelihood of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=daikin+ductless+split+error+codes
    • https://cdn-cms.f-static.net/uploads/4483870/normal_604e4e01d3268.pdf
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5feb89bda9e1d.pdf
    • https://cdn-cms.f-static.net/uploads/4448750/normal_601ae27e44d09.pdf
    • http://letxxnx.org/oxford_picture_dictionary_russiansm9xw.pdf
    • http://cosmicgig.com/wotetudoc5g5c.pdf
    • http://help-feedback-amzn3.xyz/pdf_pentatonic_scale_guitarthwgh.pdf
    • http://nudistoff.club/cbse_compartment_exam_online_form_2019389py.pdf
    • http://help-copyrighteamservice.com/11387327149zmcia.pdf
    • https://cdn-cms.f-static.net/uploads/4446494/normal_605017b6797f2.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602fa5dc586a5.pdf
    • https://cdn-cms.f-static.net/uploads/4449192/normal_6061cffebc50f.pdf
    • http://calipshatngaccs1.xyz/zosutiloketonovue5jwd.pdf
    • http://beautysale.site/38779938307ma074.pdf
    • http://vengriya.space/hierarchical_clustering_numerical_exampless82g.pdf
    • https://static.s123-cdn-static.com/uploads/4451744/normal_5fe468cebff7a.pdf
    • http://how2clever.com/que_es_un_pronombre_relativo_en_frances7gwqr.pdf
    • http://ingmijn.com/32694615448nn60c.pdf
    • https://static.s123-cdn-static.com/uploads/4416660/normal_5fefa03db4f6f.pdf
    • http://yesstore.pro/wejupowifuxe1vra0.pdf
    • http://vvd.bar/93671293673q2j7v.pdf
    • https://cdn-cms.f-static.net/uploads/4367019/normal_601dc5db0184d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_1c0b586418254d74ba286120d1ac75e0.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_727a93159aac4a878d89ad425822ca7c.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_off00011032.bin
450e149db35dd17912bb537b18f3453fcf7304384bbf4ee32f086f7fb97c900a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 5132 bytes
font_01_sfnt_off000121be.bin
291b2383b8a53fd841bef578f5f13159dc4e5021d36961d42c83834742752a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 16684 bytes

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