Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c433fca9ae9a52c…

MALICIOUS

PDF

97.1 KB Created: 2020-11-25 07:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1524455e7a2bbc0413bf2c9b4a426d40 SHA-1: 937ee44ff9cfc99038208f3ac15473743d54b621 SHA-256: 7c433fca9ae9a52c2e719c500416f4a9af7849a7324128306d136e9c7f6929af
156 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 0.9997

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
  • 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://trafffe.ru/strik?utm_term=static+electricity+worksheet+igcse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f90f01a582c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_5fa749e004945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fb3059b39cdc.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/busamoto.pdfIn PDF document text
    • https://jaxobowes.weebly.com/uploads/1/3/4/5/134591409/7a4875cd153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_5fb530fbdc735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f9baa1491a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8ce902d8947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fae7cd87246d.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
    • https://s3.amazonaws.com/gitipelut/tijipipow.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/sociological_global_perspective.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/julolir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 5104 bytes
SHA-256: ac74de90c35d120cd5015c1047c0f0f92d20792b55d2d0180471f7be65b9aadc
font_01_sfnt_off000143a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A0 11012 bytes
SHA-256: bee45e130030f03a1b0ef30d31e55ca1b54381100f2f25e289cf4da4ad3c0eee
font_02_sfnt_off0001691e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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