Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e423a4248481b7c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 02:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff98936acc33e5d2d1740e8b4495e823 SHA-1: 941b013373ace840042fee41e738c80f0f87768b SHA-256: 6e423a4248481b7cae719314a20152bc971e978f10fbf6e6fbe0a3e21473f5a5
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://xajibur.ru/123?utm_term=the+secret+garden+2020+castle PDF link annotation
    • http://rivozuzeno.mywebcommunity.org/96108124606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448980/normal_602d7fd2701f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_5fca981d17953.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_5ffd446c91df0.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/c98688719d074f.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/what_size_tires_does_a_2011_jeep_wrangler_have.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_6020895c21cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_601b42d72e9c3.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/ginuvokutitadizemiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5fd7f7b79cd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_602a185107d02.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/guzitirijitesa.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/duwajogunose.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/how_big_are_the_tripods_in_war_of_the_worlds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_6007e13739ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_60338a26eda3b.pdfIn PDF document text
    • https://komipakokituk.weebly.com/uploads/1/3/5/9/135993761/jepufef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5424 bytes
SHA-256: e65b69ca0aa6456d824fff18511b50c3bad41ef0623540ccd173a8154ecd4911
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10876 bytes
SHA-256: 7c0f494c33ad3fc915f0078f79e6ec3b03af46ea7077562c2e7dd8fc89b4ee9b

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