Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9f38ed3e38767a…

MALICIOUS

PDF

66.1 KB Created: 2020-11-10 18:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cd12999a2eb423ff1baa94b9280d19bb SHA-1: 1a6b0d387794e4658e93063efed472dbf8691a2b SHA-256: 4d9f38ed3e38767a9e785cf7a08e7746fdb51798f5fb3504b2866121bdf7d3a1
156 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/123?keyword=video+recorder+app+free+windows+10 PDF link annotation
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/bcdcbe7d.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/lasogefitefapug-rogemukakepoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5fa9215c350ad.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/vomobefifexi.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/lejivugeleguwod/artritis_reumatoide_dieta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55821ac1-95bb-4156-a860-5337c7413c71/musicians_friends_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb3587a-75c0-4613-80e3-404e4c996727/david_mcgraw_30_day_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0c9d97-0bcb-47e2-84bc-30f32ba692bb/91202392765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6616211a-bd8e-4dcb-9ca1-7f48479e707b/jukidojotukobifa.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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 5368 bytes
SHA-256: 9fed88422c680be1cada6e449a5e72276de031b8479e931f1e2e177ef53af538
font_01_sfnt_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10700 bytes
SHA-256: be39799d6b41151a1b3e231f643bab7f02d331ff826a0d4b2848bd2e67e0cbb9