Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb48dfac491d887…

MALICIOUS

PDF

73.7 KB Created: 2020-12-23 13:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dd78f6b6a780f6539b53b6fbd2aafaf7 SHA-1: 9e84b515becd62655a81eb579ecc04e9cd719f75 SHA-256: 4eb48dfac491d88793eeb20ecadafa679463a94b1e5bb7fafe9b06248ea64940
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm for SEO manipulation. One of the primary external URIs, 'https://trafffe.ru/strik?utm_term=mod+mutant+creatures+1.+7.+10', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffe.ru/strik?utm_term=mod+mutant+creatures+1.+7.+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fa457775ea7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f894d5aee618.pdfIn PDF document text
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/gejubebinixabezot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fdfd67324fe7.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/biwerutilamow_putagijovexeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f9e5b5902eca.pdfIn PDF document text
    • https://bavifogo.weebly.com/uploads/1/3/4/5/134524367/dijubal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415756/normal_5f9ef09301eae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb4bb46bb44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_5f98185147b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fc2042e0eacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5fc2dd4a4d804.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/divikufifir/jamarumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d84905-705e-4da8-9cef-b8e395eedcbc/6263455263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e259b570-e06a-4e1e-8a9e-8fb7ddfc47e7/28804118037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbe1a0c-92f6-4533-a34f-f548755d0851/medical_lab_science_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1b1cfc-5c09-41a2-beff-91ed44cd0e22/44101569881.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/kinetic_energy_science_definition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 5364 bytes
SHA-256: 6b35852529768a59fc8973e96d812ba88eb65d55cf413f82c1aa6031d8218a64
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 10616 bytes
SHA-256: 2de32b3fbbed64a3dc6c85bce2edead2dc68968792360c7a13f239409b6e2f73
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16064 bytes
SHA-256: 9b78b915eb75ef0aea6965a6113565ca1bcac7735c766488ce9f12ff332a71b4

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