Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ae056c236876b3…

MALICIOUS

PDF

59.7 KB Created: 2020-11-14 09:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 20e86765cab3d59d6bdb5458dd4f944d SHA-1: d391d3f8d4e65da41d16514086c6a56683174242 SHA-256: 16ae056c236876b3bbc7dae2958ee52ccbe9a12154fb7de31bfea1cada476f25
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=1001+cocteles+libro+pdf In PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/3604300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5faf738b16027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5f99ad904349a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fa8980e0c884.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.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/wajibile/aircraft_engine_design_aiaa.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/32809076226.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/gkd_metal_fabrics_omega_216.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/educational_technology_jobs_arizona.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/fidowamulefuzakerubive.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/bexuxebexifofupe.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/the_colbert_report_final_episode_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/c_programming_tutorial.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_off0000ac5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5D 5176 bytes
SHA-256: 200a06909e805e9d3a6561dece9c147e84b5a35022ca903454183ee6aa522c4a
font_01_sfnt_off0000be01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE01 10568 bytes
SHA-256: 29ddd8e92c6e8b3adee11d24713c0942ab017a4e960c0442719ed73a5cbc8852

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