Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3960cce025e137…

MALICIOUS

PDF

67.4 KB Created: 2020-11-26 02:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8e9d3a6be3917ae03362689af14a83e0 SHA-1: 2ee8cf6dc562b71b838c548414b5b7bae457182f SHA-256: da3960cce025e13792ff387a391acd41c74c82f60af7e983a798a4fdad8c50d8
186 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 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/strik?utm_term=best+buy+baldwin+open PDF link annotation
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/d66f6462f2957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fb5b3ef36fd9.pdfIn PDF document text
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/gikozedukinosa-depovidopi-detozizorifizu.pdfIn PDF document text
    • https://bazawafamojuw.weebly.com/uploads/1/3/4/5/134508147/3499186.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/kibaxipubaje.pdfIn PDF document text
    • https://lomofatawepap.weebly.com/uploads/1/3/4/5/134599642/6564607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_5fada7b97ea30.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/fatinafige_mobunomuvugejuz_tinugakoze_mevirisef.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/mevavi.pdfIn PDF document text
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/aa8f46fad91.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/lunojol/9653634841.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/85690049023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59429a04-3867-4871-ad5a-50d694441fbe/satelec_p5_newtron_scaler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fedd42e-fff1-4462-84a7-715619b7da85/rexawusetufufos.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_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 5240 bytes
SHA-256: 35e56e0333939c963a98a01fc7d7704c2fcca3e8c184fd82d2a981ea78205f9b
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 10928 bytes
SHA-256: 305cf3bb6f8df8649c11b88d1ff6b55584b4284650dfac1ed29bb6978bbf2237

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