Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7e92eeede131df…

MALICIOUS

PDF

67.3 KB Created: 2020-12-14 15:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8ac9d153fa1fd74b83f21a60809b4838 SHA-1: d6e3699fd632d6e66a235d18b892d71930f4135d SHA-256: 3a7e92eeede131df7cce88cd31609b2099b73b86dfcc4d09f3b7e581c729fe4b
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://trafffe.ru/strik?utm_term=1+night+in+paris+rick+salomon PDF link annotation
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/9e691c944b7b7bf.pdfIn PDF document text
    • https://milunuxuv.weebly.com/uploads/1/3/4/5/134529922/nulururusig-solemugisik-wuxisego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fa48ff0c9ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f95e27e78080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_5fba3d5998986.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/2929351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fb55a578f688.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/votot-xitimoxidena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_5fae56c1cf588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f8d109d53932.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/5066af08e06af.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/112480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fb34c20227b4.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/07975bfa-de1e-4368-ad56-7fc3a28f0f2f/livro_sobre_analise_fundamentalista.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e8bb2c-09cb-4548-b876-aa0032f4e44d/terminator_2_free_online_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a0e6b0-a347-4c5c-8ae7-a88c7ca96547/37442929824.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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 5368 bytes
SHA-256: e38aacbe6203d94b5cf7fac2c2179d63b30536b608b02e18407436b8c29bcd7c
font_01_sfnt_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10504 bytes
SHA-256: f6f54e44c0ee6e8066413684569727aca10cc910afa9904ea3e2240402fc3fe9

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