Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e24c0b5ffb2831…

MALICIOUS

PDF

71.3 KB Created: 2020-11-17 19:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b10bd3098cfc7508a85eb38ce9f6f81b SHA-1: d3f8028b0a3b0f77cec32b6eacfa7039a03ea5d6 SHA-256: 37e24c0b5ffb283193563d0321831e3412b2bb34e7adae7b3e88cb98806616de
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=charlie+y+el+gran+ascensor+de+cristal+pelicula In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f87d288b4da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5fad5aaacfb64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_5fae6313b70d3.pdfIn PDF document text
    • https://xolawawasaxigu.weebly.com/uploads/1/3/4/5/134587427/4663148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f9b0ec282897.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/0776d8fc22.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/960849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f916148b1925.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/gurepakuwur_lawoga_zubifisovazo_lagotenosodaf.pdfIn PDF document text
    • https://minibimegoviw.weebly.com/uploads/1/3/4/3/134333268/gapemapodoxotadala.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/zuvokepixezosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5fa16e12c8c2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA01 5340 bytes
SHA-256: 4aa14b78e665a11477afe4fdfcc99b15bd50a17d72e32edbf72db566ca452a91
font_01_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 11796 bytes
SHA-256: e79c3ea1dd878f229557fe7fe3e3064960efb96e325e6932aa0598967c34e9f0
font_02_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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