Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b0dcafa4e6094…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 06:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8cde1854f04c5576130f208b59be397b SHA-1: 9d92934aecebada5b367b622eb2bc0775baa815e SHA-256: a81b0dcafa4e6094d3d4289a4dfdf2ca677779b6ab8854525f82bead0619bfe4
226 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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • 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://dugedepap.ru/award?keyword=riskwatch+algorithmics+pdf PDF link annotation
    • http://bestgirl69.com/an_occurrence_at_owl_creek_bridge_questions_and_answerse5qm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479674/normal_600ebc587026b.pdfIn PDF document text
    • http://lowwsaw.xyz/jeguzonejikibifitofugaqiml6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_60044ac225197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_60460d022ef5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_601ae0cd851ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6039a8643c0fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_6036a6a103a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_604b730d45706.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/suzup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_5fcfb7e58b733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fdc88067d232.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/bamol.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/71e950632d2c.pdfIn PDF document text
    • http://profaudit32.ru/singer_237_sewing_machine_review3zzrl.pdfIn PDF document text
    • http://neyroskakalka.site/examen_potencias_y_raices_3_eso_aplicadas48ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_5fda351da8b8c.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/tojazudibumogab/angular_6_script_in_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/dolasugex.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/basic_computer_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/how_to_add_jasper_report_in_netbeans.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5732 bytes
SHA-256: b6800105ba9ea71f73f5083eb51163851b71ac20bed10bfcd81b5e690b16f790
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11708 bytes
SHA-256: 6e2c833a7bc35299e683ed39a2ba0d0b26829003298e44634a7c920a4cd7cf4f

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