Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed538999cd80dcd…

MALICIOUS

PDF

81.3 KB Created: 2021-04-04 23:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e1d4dbd349a84c1680607be8ca062347 SHA-1: 2602f870a5726e662c9ff2f5bc9b364098745b01 SHA-256: 5ed538999cd80dcd8f4b6933ea00ebf84567f01ab128f8d4fa0d7c1e9620381f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious sites for further exploitation.

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://resalured.ru/strik?utm_term=link%2527s+awakening+walkthrough+switch+key+cavern PDF link annotation
    • https://narezivif.weebly.com/uploads/1/3/5/3/135307162/gafudimenomotugemil.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/census_in_kenya.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/rojok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600a0c99cef67.pdfIn PDF document text
    • https://busegozujukot.weebly.com/uploads/1/3/0/8/130874370/nisasolivujilul-ginuj-nedajes-tujubulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_603d07720d756.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/ugchchj/224893685.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/eHkBUha/23217110428.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/steering_the_craft_epub.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/bel_ami_maupassant_gratis.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/verexuvafisifixewesaxojuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojiwifi.epizy.com/irs_form_1041_capital_loss_carryover_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/bupepupetexitazek.pdfIn PDF document text
    • http://bejuxufuvojofa.rf.gd/bose_speaker_soundlink_manual.pdfIn PDF document text
    • http://nipadisunusupuf.epizy.com/43838365617.pdfIn PDF document text
    • http://sugebajofurite.rf.gd/10181890513.pdfIn PDF document text
    • http://gazugitub.epizy.com/d_d_classes_5e_artificer.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/calculate_stockholders_equity_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/55173319208.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_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 5356 bytes
SHA-256: 9005e74f71f0e6864a05b6d2d2af6f8e94caa1680fafae767d92ef6962780320
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 10272 bytes
SHA-256: a87b9a499a332b3a23eaf99a8e762e03c14c85bfe9c6f89f3b9976f16e65791e

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