Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e9d77b637a55b…

MALICIOUS

PDF

68.0 KB Created: 2020-11-25 08:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cff3d59eae6c627a27152b22a60684e6 SHA-1: 9686d0512976c458a1d8ce94bae7b956f526a541 SHA-256: b65e9d77b637a55bafca98b1cf88d7f00f84ad87fca3c912f36dac03f46e26bf
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=case+files+internal+medicine+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f9e2fd06f6fe.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/rugoganaj_tutulemeluso_zubakevepat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f960ca57bdde.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/viges-raviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8a1725038d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_5fad683416636.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65a3051-058c-46a6-abfd-6115db97ed50/bsa_motorcycle_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc01ea7-cc49-461c-9bec-f7fc523c56b1/por_el_placer_de_vivir_cesar_lozano_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/nodudewunamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0d0df8-2df9-4774-a5b4-aa2a2594d15e/clear_sky_elementary_castle_rock_co.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02a9ca0-eab4-45d0-94ac-77363533a64d/36211592535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc8b924-7893-481b-bbb6-cf8eec737265/mac_os_x_10.5.8.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/32216150583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc86f76-a0dd-4ff3-bd0b-ea4df5ad2078/toileting_self_care_deficit_nursing_care_plan.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_off0000cd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD37 5208 bytes
SHA-256: 1d58df2d99084880444287c929e13724a9dc22603cfaf2ad79e65f240b19ee82
font_01_sfnt_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 10760 bytes
SHA-256: c11ab03a3f4bf075a7d10cc1df425ba0744f0bab9d59d6d7cebdc27d17c64fd7

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