Malicious PDF — malware analysis report

Static analysis result for SHA-256 79489e6ad9b1dcaa…

MALICIOUS

PDF

129.4 KB Created: 2021-01-01 07:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c9c3800e1ede63a0945a660690f4e21 SHA-1: 926a32b579ac7843558e52e1e21eaadec32b6d9e SHA-256: 79489e6ad9b1dcaae26f76c4bd96977da04c9f4c36138296facb0eaf93abdc52
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?utm_term=edmodo+for+parents+app+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f9604152e2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_5fadf59a42a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_5fafac4f026a0.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/serabusapod_votexib_sekoxuko_puvowevuzimizuf.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/xibimulatasojewas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5faf0b41cd7b1.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/dutalif-wudewemutof-lijurofasupa-xogareze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f99079335017.pdfIn PDF document text
    • https://vepiduworubul.weebly.com/uploads/1/3/4/7/134723348/6046658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lurutopobi/levubuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72913ce-2b34-4170-9519-e471f1710476/gta_vc_mod_installer_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbe2b52-c496-4c96-b16c-a8434c1bc28b/dimasesonekoponesotibegel.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/39771750126.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/1367701658.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/45230547262.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/splash_potion_of_instant_damage_minecraft.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B300 4900 bytes
SHA-256: eefe53fbb203522a1b8519044d87bcab962259cf6f76a6f17a34a5c236f9469f
font_01_sfnt_off0001c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C38D 11504 bytes
SHA-256: 68b97544b9daa26199e075ae0c2d6e6d76d73d9980043d31243dc7e38f0044f9
font_02_sfnt_off0001ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA19 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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