Malicious PDF — malware analysis report

Static analysis result for SHA-256 af75a76a4e15843a…

MALICIOUS

PDF

73.6 KB Created: 2020-11-18 14:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4beec7f26e72279ccf3fd1c13719f122 SHA-1: 14d1241e3e1ee906259c53cd77ce8364bfd266c2 SHA-256: af75a76a4e15843a5a2e77d46032fc732acb7fa51b87bbff79c0c461bda3e7d8
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 benign-looking PDF files hosted on S3 buckets, but one prominent URL, 'https://trafffe.ru/aws?utm_term=silicone+gel+sheets+for+scars+in+india', is flagged as unknown and is likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. No scripts were extracted, but the structure suggests an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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/aws?utm_term=silicone+gel+sheets+for+scars+in+india PDF link annotation
    • https://koradafad.weebly.com/uploads/1/3/4/6/134617683/41388fe3c1bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_5f9fe2b27d22d.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/ganubifirigevi/anatomie_de_l_oeil_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/potato_and_onion_bin_plans_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/health_career_pathways.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ed75f7-da06-4931-99f2-ac3536a1aa73/49570829197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1694536d-a7df-47d3-968b-ab68fe735b59/83046467917.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/ffxi_whm_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/sodupebezajuzotisukawu.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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 5172 bytes
SHA-256: bcaf45ab70563627831b16d1857e6104f6be66205d251c02016ce37e0f576ec1
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 11012 bytes
SHA-256: 7fc03a2985b7199f228a702e9b6dabce22be78ce285d95cdaa0a0c6aa3b53605
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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