Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9156251afd4d2b5…

MALICIOUS

PDF

70.8 KB Created: 2020-11-30 05:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 06c8bb3c52ccf062b2d35f0a66181e2b SHA-1: d9f7c41ca5c03c1352b79b44eeb254de7945adb8 SHA-256: a9156251afd4d2b5ee6a957f734b12571675d2a1b3547a943a4e54dbe5637009
222 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, routes users through malicious redirector infrastructure 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=nba+2k+mobile+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_5fb56adb443d8.pdfIn PDF document text
    • https://zulozagadome.weebly.com/uploads/1/3/4/3/134318764/pepev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450424/normal_5fab860191b8e.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/muwesefat_jepabuvimite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_5fa8d62f03adb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8d7b0a8c24d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f98a1fadaae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fb6e6d09e5dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5fc1eaa0bb749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f9639ec87245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5fbff74c3167b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fa64f7153d47.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/3d46ba99-e446-429b-b258-26fbbf1a20b1/zutamitazefazewisalokoxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fleming_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cc379b-c949-476b-9409-d8d08048d2a7/clek_fllo_manual_2015.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_off0000ca8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8B 5232 bytes
SHA-256: 89251f377cffe4c9a73d4e2ceed24faeac721efe027beaf692e5a36b311e5e25
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 15596 bytes
SHA-256: e451f115abf8062a6d3d68825c9d2937901bcf7717041b2cc64dcf45be696c23

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