Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c392eab563c0d65…

MALICIOUS

PDF

64.6 KB Created: 2020-11-13 05:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 57d4a955c4c751e8e0231778c50afde6 SHA-1: 51fab488c38c181dc9c91ab4a69eb9cb40a36ac1 SHA-256: 3c392eab563c0d65cb084b2d4ece8d7ff3391f0444452e7934c4c041e963e04f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly hosted PDFs, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffi.ru/123?utm_term=eve+online+pve+guide PDF link annotation
    • https://jiluzeros.weebly.com/uploads/1/3/4/3/134365673/kalid.pdfIn PDF document text
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/205cb180a9e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f962182e6010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f8d440be0c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5f93a9e03c568.pdfIn PDF document text
    • https://tokuguzeg.weebly.com/uploads/1/3/4/4/134464653/runesiki-wanakip.pdfIn PDF document text
    • https://lemefinafotujux.weebly.com/uploads/1/3/4/6/134606632/burekixa.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/wejuvono/47072801573.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/organic_compounds_containing_nitrogen_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/kolibivatato.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/thoth_tarot_card_meanings.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/90190456299.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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 4660 bytes
SHA-256: 159ab026a6ce3cb27a98f19b62ca040c8c0eb2e37f7f86fc816d6ac8ee6225a3
font_01_sfnt_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 10848 bytes
SHA-256: 29750d97cd99433d5adfcfb097d4295fd25bc2051e920d1871507600cfaaffa2

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