Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5771a8afe09fae…

MALICIOUS

PDF

95.6 KB Created: 2020-12-24 02:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e5de2ce292fcae577688552812a07f1 SHA-1: 77385b3f0349b1e4497483c2fe8c3c20abb7cd4c SHA-256: 4f5771a8afe09fae5a3fdd22e55d14824fc89b6fdca40cfeccc2014e1a33e207
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to 24 external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a redirection mechanism to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=hide+and+seek+games+to+play+outside PDF link annotation
    • https://goxagakile.weebly.com/uploads/1/3/4/3/134316835/f044b43f.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujuva/Ngejim8/40840124700.pdfIn PDF document text
    • https://dipejabixeg.weebly.com/uploads/1/3/4/7/134716175/3975549.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/V8igghR/vaxaguz.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/dejolavubukugeb/15876239320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baab6e44-cee8-4521-8835-bf99e91e9e7a/sipofimevifonivibejigewew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae7e6fc-4e99-4b64-8fc5-dd5c5375cedf/physical_landscape_of_italy.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/airbag_deployment_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28547532-1804-4295-b920-4ced7b6f4fa2/mens_room_decor_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afda3ff2-7eaf-4be2-ab5d-a758a8093c0b/xbox_one_manual_eject_won_t_work.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/free_cloud_computing_powerpoint_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/timafatafej/tubidinurelir.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_off0001396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 5308 bytes
SHA-256: b994d304862a7be2ccdc07610fbd35c6d145ddce0eb9adb655baebd8ba00c0b8
font_01_sfnt_off00014b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7C 11188 bytes
SHA-256: bb1f38a90c19d62e4a927fdc5faee77a468e42d27dea849ff044cd280644c789

Open this report in the interactive analyzer, or submit your own file for analysis.