Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d22ad5e50d3e0a…

MALICIOUS

PDF

85.4 KB Created: 2021-01-06 15:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37bb2ec6aba5b47ae2ac08518d751166 SHA-1: d74c170cce7fb30b9605b2553392cb0f0cb96004 SHA-256: d4d22ad5e50d3e0ab2c89d05248b9f535b9f5ca48410b2bdb507cc088cbb5f4d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to Weebly-hosted PDFs, suggests a link farm or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=chrisley+knows+best+episode+guide
    • https://semogabetik.weebly.com/uploads/1/3/1/4/131482882/2486993.pdf
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/1545759.pdf
    • https://ponopuxebi.weebly.com/uploads/1/3/4/3/134365602/batadazana_zaxumizage.pdf
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/botow_wovutiz_rosusudeju_sikopafebuxaze.pdf
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/4008358.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/janodojivi/calcium_rich_diet.pdf
    • https://s3.amazonaws.com/pulujolatepuv/kifepanowupudo.pdf
    • https://uploads.strikinglycdn.com/files/f49aa07c-d434-453c-81ef-11dce77b309c/mipitagurujalelodije.pdf
    • https://s3.amazonaws.com/pubopelej/formasi_cpns_bandung_barat.pdf
    • https://uploads.strikinglycdn.com/files/c6373dde-e924-4d6d-ade8-332d92815ccf/zujova.pdf
    • https://uploads.strikinglycdn.com/files/9a380099-2279-4e15-a5d1-99b8e3d8f107/resimalav.pdf
    • https://uploads.strikinglycdn.com/files/498651f8-0209-47f5-ae3b-209fbaf8e8b4/relamal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cff.bin
1744fb9e910b7e108de206f57f03bf0efc09dafb7b888fd2a40a6677f0506179
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 5316 bytes
font_01_sfnt_off00011f18.bin
8054bfba1e45b0fbca5f884daa500970e19f87fb8c976da97f69e0ab948fb19c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 12884 bytes