Malicious PDF — malware analysis report

Static analysis result for SHA-256 121da08ff0309c44…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 11:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d395dc72eb5d1e09c915a3b970be8a25 SHA-1: 56ec898666baf932ac49c5c1c76ca4a460ef1dc4 SHA-256: 121da08ff0309c447ad9c98345655b339b261e4731be55b944247f82309136ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a malicious redirect. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

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=hcf+and+lcm+worksheets+for+grade+6 PDF link annotation
    • http://lamejix.scienceontheweb.net/mamenoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_6004118599c3d.pdfIn PDF document text
    • http://vabademajelid.iblogger.org/49078292624.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/arcelik_washing_machine_error_codes.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/78796331269.pdfIn PDF document text
    • http://matrixbicycles.com/mcgraw_hill_education_books_of_ctet3kjme.pdfIn PDF document text
    • http://bizbize-yeteriz.org/676410047498jc1p.pdfIn PDF document text
    • http://prostosite.site/39531209238a6k7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413465/normal_6001ff65571c3.pdfIn PDF document text
    • http://bred-enligne.com/adobe_photoshop_cs6_fullu96jn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likifodafiduno.epizy.com/indoor_vs_outdoor_activities_worksheet.pdfIn PDF document text
    • http://povivubezili.rf.gd/abc_australia_international_tv_guide.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/desperado_eagles_piano_sheet.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/how_to_start_an_analysis_of_a_poem.pdfIn PDF document text
    • http://lemujiv.epizy.com/bemariwemoxekalonawuberin.pdfIn PDF document text
    • http://todazanimidut.epizy.com/sunbeam_microplush_heated_blanket_with_comfort_tech_controller_full_queen_brushed_nickel.pdfIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/how_to_reset_lg_top_loader_washing_machine.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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5704 bytes
SHA-256: 8831ccd870755f93f315d1e3f5bd172795521af170c9450f0ab718c994e84a96
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11304 bytes
SHA-256: c172c56ee81ccb70c0f6831cf5311ee3c1e68844a1dd5eaa12c133f9f8d1f9c9

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