Malicious PDF — malware analysis report

Static analysis result for SHA-256 a640f50854e5af4c…

MALICIOUS

PDF

87.7 KB Created: 2020-12-27 05:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fc3f8258f3fad80563335b0a5e688d5c SHA-1: a5f258912f4ad965fdc1590cb1c76f8e69724e81 SHA-256: a640f50854e5af4c68699f3cedca0fb0534f92f0774d18cdab2bf2f47678db70
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-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.
  • 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://traffking.ru/strik?utm_term=stair+treads+home+depot+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fcbde7d75f3f.pdfIn PDF document text
    • https://biwalude.weebly.com/uploads/1/3/4/6/134613088/kudepewiwunuron-mikokesorinak.pdfIn PDF document text
    • https://raxitiladiruwek.weebly.com/uploads/1/3/4/4/134487911/lexerufidenoxof_rakajiwujel_kavofavivepog.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/666d48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fc88450b9640.pdfIn PDF document text
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/tazegulipebejudixa.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/231898.pdfIn PDF document text
    • https://cdn.sqhk.co/numexerab/k2Tmgfc/2_player_shooting_games_unblocked_at_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fc9336899326.pdfIn PDF document text
    • https://javowutimor.weebly.com/uploads/1/3/4/0/134016661/gonalarisase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_5fa0314e9c36a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5fd863671849f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59980c70-1fb6-4214-bfbf-b9372bde4550/jolen_creme_bleach_instructions_video.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_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 5384 bytes
SHA-256: 7d8b2276aadd4e95503fd1d098f2ae7e9afcf26ab28726bcaad0c18f634ab43a
font_01_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 11104 bytes
SHA-256: 0e12b1081497106622864536861799d3a41cc98a575b5bcb14d4e5d7baf40210

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