Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d372867cba20e95…

MALICIOUS

PDF

75.1 KB Created: 2021-02-19 13:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 50aeea6b8f632dc6941c0a22c876bc21 SHA-1: d9f34a8aa3b35e1241bd710781dea17ffcc0349c SHA-256: 5d372867cba20e95a093843e723490bf6c15e00341efd7b4121e371879a03bff
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest an attempt to drive traffic to potentially harmful content.

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 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://maypoin.ru/strik?utm_term=order+of+marvel+movies+in+chronological+order PDF link annotation
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/liloselepakewiw.pdfIn PDF document text
    • http://academic-club.ru/582372952078owf4.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/xidegal.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/mewutopijapijot.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/virifebika_mibut_sakiminuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fe3834423e02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_60067fa0aeef6.pdfIn PDF document text
    • https://namoturobiro.weebly.com/uploads/1/3/0/7/130739164/saxazevanemapa_xogesimasilero_tepetorake_pemorubod.pdfIn PDF document text
    • http://startask.ru/mokulibazuvenodekapakanepvxca.pdfIn PDF document text
    • http://claire-irk.ru/bluebeam_revu_cost_ukqb4ub.pdfIn PDF document text
    • http://ca-management.website/add_canon_mg3520_printer_to_wireless_networkr67n5.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/6685837.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/vinivuxo/digurukefepifuzufelosexi.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/advanced_safety_system_in_automobile.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/anoreksija_i_bulimija.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/bangla_movie_bastob.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_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 5520 bytes
SHA-256: 6fb03719fe8a5e225f6d5d4ca11cb6b624b03b7033535b8102aa1d2fd2162f80
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 11148 bytes
SHA-256: 153c64a7bc88b9f8bf45a472c3c440ee9c52d3717b468c5801f3d86a426a64c1

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