Malicious PDF — malware analysis report

Static analysis result for SHA-256 43891e69467827ad…

MALICIOUS

PDF

63.3 KB Created: 2021-01-06 07:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 526cf80bf527bb11c600446a1ec5f591 SHA-1: e9d811c0d59f29ed1268bb78fb3ef39481a3dad4 SHA-256: 43891e69467827ad3e4829f77d55bb1eee251546def0b2250ee8fa1876afdead
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=gig+em+aggies+neon+sign PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fb3c84dbcb29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fcd3eb61f9a3.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/b2b6d5b12fd.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/pisewane-ludakin-vuwitafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452594/normal_5fec7bba9f11a.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/lagezezus_bamidadakevi_wotesegagu.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/cab8de67-a366-4d0e-82ce-7d7a675cad38/51297282167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e545ae-154d-401e-af5f-7383f0c04d25/wibufomanononiwuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dac8e6-aaa7-4629-8bcb-2b4ad9bddd4d/74045591215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26272db-7411-4fbf-9ccc-829e1e8b32f3/34940108588.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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 4908 bytes
SHA-256: 1fcdd380ae5152c3360900e8a18a183fa785b7840ab3157e3498e46798c1a4bc
font_01_sfnt_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 10696 bytes
SHA-256: d8a7bb3f0de364a921d2bc44bc0e11a69bca5b5b1905bc7db65dcf8ded7accb1