Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4869b3e0cd32d47…

MALICIOUS

PDF

68.3 KB Created: 2020-12-31 09:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 344739a87611890eae6858d857d6dd62 SHA-1: 98b1a113f726075ffa8c6d218bc0f1c136ab8e88 SHA-256: c4869b3e0cd32d478bc75ea36288fbcf1e67b6d97ea417791f1f0e5e5047c09a
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one URL points to a suspicious domain. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of PDF links and the ML classification suggest potential exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/strik?utm_term=steel+fold+up+table+legs PDF link annotation
    • https://puvujoda.weebly.com/uploads/1/3/4/3/134326666/8581223.pdfIn PDF document text
    • https://cdn.sqhk.co/zozotetowa/hiibFii/18652930701.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/tuwagaget-fojepevan-rawabu.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/iiig0ib/3217460471.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/rotupetawapusax.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/f03c1182fc06f.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/02396136d.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/bakoloj/free_powerpoint_slide_templates_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/affinities_of_protochordates.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/functions_of_centrioles_in_a_cell.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/gixopuzoxisorugivadesefik.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/1608335551.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/using_sentence_frames_with_ells.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/android_sdk_install_apk_to_device.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/woodworking_workbench_plans_free.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/left_side_menu_html_templates_free.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_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 5356 bytes
SHA-256: ab98b246d086da1005ad99336eb7316e16ba944faa71a107f8f7ddb7e52363a5
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 11380 bytes
SHA-256: 7d9c269c756e72796a3ce9d94f197da2218ee2884ecb3efcfaa7d1a1d2c31385

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