Malicious PDF — malware analysis report

Static analysis result for SHA-256 d586f688b52d6a74…

MALICIOUS

PDF

68.4 KB Created: 2020-11-30 18:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3853b683067d19a235ae2fb7dbb36c49 SHA-1: d9545deba968778eb8f89b232c98ddab41ff3b69 SHA-256: d586f688b52d6a745a6f543d26b200546a20db077825bf50766e20a72ba183ed
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?utm_term=open+admission+form+of+du+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5f9e62bb0ad05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5f96128ad71b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f94f3f8d9657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5fab52c0dc53a.pdfIn PDF document text
    • https://vesogotupu.weebly.com/uploads/1/3/4/7/134702950/62c8da423ba1b0.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/68aa9019.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/dorulusof/vonoxuxamololipidanuxuwam.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/magisto_video_editor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/blender_software_for_ubuntu.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/whatsapp_messenger_apk_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eaa17fb-b331-4790-8003-2d6978835f5c/93869396675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb4786e-b98f-45c8-890b-67991573c01f/34609876493.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/bankruptcy_and_insolvency_act_2016_nigeria.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_off0000ce1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1E 5700 bytes
SHA-256: 9dc5a694801b1d73ba1515abe6de176c9df1dda700546396f9e3ff04820e2e15
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10496 bytes
SHA-256: 485096f20e061b47bea1c8a1ba043ee0142416666be9bd877d8a1dfa35cdabec

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