Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e87afd9d7f2785…

MALICIOUS

PDF

78.2 KB Created: 2020-11-11 21:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 54c764d933f8cc85ac22224a5685a83f SHA-1: 9d1f8da6bc9f47eb2add1c7ad1371f82de04b1f8 SHA-256: e4e87afd9d7f278548d9d48c3f09e90298c747b93964ec259138b97b14b56703
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-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://ggtraff.ru/aws?utm_term=vista+higher+learning+descubre+1+answer+key In PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/7958529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f9d8db9ddf08.pdfIn PDF document text
    • https://taferirufip.weebly.com/uploads/1/3/4/5/134582969/d074c0b2fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f9390eb9c251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5f8cf11273683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f9b1731a5dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5f9acf5753649.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/4106206.pdfIn PDF document text
    • https://vovisomesosaza.weebly.com/uploads/1/3/4/4/134462399/eed654.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/fosagobomap/tawakavun.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/aztec_princesses_names.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/83820740488.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5616 bytes
SHA-256: 605d74bbb9663ea8a4d10a873f8b1ba6b56807b03866b9860caa578b30d48ac1
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 12432 bytes
SHA-256: 72f6df33f725f824c70cb260a25cfa44a16f6c9f5a2c026ce5b7af05e03f789b

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