Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf025edca37c7fd7…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 07:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8747d6385b0383d50fd98d029ede8cdf SHA-1: 7a50cd0c76c156a3b93ca61f8647c911dfb27ada SHA-256: bf025edca37c7fd76f991033d20f834e38a0c0a9b137bc5cc9fece95a1bddc3d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as legitimate documents, 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 embedded URLs point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=conflict+resolution+in+the+workplace+training+manual PDF link annotation
    • http://reduslim-eu.site/project_on_hindustan_unilever_limitedkb194.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/b4e5db2.pdfIn PDF document text
    • http://kekebum.22web.org/73816143134.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/lawudagudujafv75tq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/fexamibatuwamapizek.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/what_does_an_ankle_bracelet_mean_on_a_man.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/manual_camara_canon_eos_rebel_t7i.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/cdu_library_law_guide.pdfIn PDF document text
    • http://gofirog.epizy.com/pevejifegizi.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/kokezozaratemobev.pdfIn PDF document text
    • http://kizarepopudoso.epizy.com/fugexufidijuxopewejesome.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/duragal_easy_painting_and_corrosion_guide.pdfIn PDF document text
    • http://pexomesukifek.epizy.com/bumetuguranemavalozuku.pdfIn PDF document text
    • http://melewurimepuja.rf.gd/9822837258.pdfIn PDF document text
    • http://wagarimorule.rf.gd/sedaxilenitubiduj.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/xejipuxawinafot.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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 5488 bytes
SHA-256: 6edd5f858fff697c009cd798790911fe003171ac49f384f1b9d0a7393ed4d019
font_01_sfnt_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 9916 bytes
SHA-256: 537587084d9b425d9027315cb5e2ecd39f7180f9aa1f4a5de12533c78ca2331b

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