Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf493ea1149af021…

MALICIOUS

PDF

65.8 KB Created: 2020-12-17 11:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eca6016eb35eadd8f152b6e49e4fca07 SHA-1: 30079c3a082058fc360d4ecfa8093528055e69cc SHA-256: bf493ea1149af0213923488909cdbd8821dfa2c804d824e97e94cbbf1c0e62a8
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=what+warning+does+h.+g.+wells+convey+through+the+story+of+the+eloi+in+the+time+machine%253F PDF link annotation
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/674c86b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f9fd5ea290c5.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/bobejurasu.pdfIn PDF document text
    • https://zisaneviz.weebly.com/uploads/1/3/4/3/134319132/9978142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_5fa95be602693.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/pogovezalovakog.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/a26dda.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/6857609.pdfIn PDF document text
    • https://lexurugimakosus.weebly.com/uploads/1/3/4/7/134718338/b91b70c5b831b0.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/wonoti/75984770243.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/65447862172.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/mubefosabupoberubesejowu.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_off0000c4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 5876 bytes
SHA-256: d6c918eed5eb5dee4d21f5b0d0287513e9df3361360a0e0835cfa08644445442
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 9544 bytes
SHA-256: 8909b858583bfe99a9c32df1320d1a6fe8d9a74ea5a09ad0b2e84d21cca7cac7

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