Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b6cf1eb7166a4a…

MALICIOUS

PDF

76.7 KB Created: 2020-12-28 16:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed4d32b9e7bc9598778eccc4bd49226c SHA-1: 9867ed8fc32f72bcac802623f4e6fdd418493f06 SHA-256: b2b6cf1eb7166a4ad1d4a3866db213aaba4557044fe8e64461bc34264b4293ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, directing users to various PDF files hosted on disposable domains, likely as part of a phishing or malware distribution scheme. The document body, though heavily corrupted, contains references to 'bubble shooter game download for pc' and URLs that are part of this link farm, suggesting a lure to download potentially unwanted or malicious software.

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://trafftec.ru/strik?utm_term=bubble+shooter+game+download+for+pc PDF link annotation
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/dozuma.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/lodoludawix.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/midetumuje.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/kozeguku.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/02785e3c4543.pdfIn PDF document text
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/7463022.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/1305396.pdfIn PDF document text
    • https://jejejawoberug.weebly.com/uploads/1/3/4/7/134768650/zezad.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/5d767.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/lomuper/81844639960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a50a6f-2b7d-4a4b-95db-00b5454740d8/65089820931.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/felibegota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6d4f1d-d186-43e6-9a04-39db996c5a56/guia_de_estudio_para_ingreso_a_licenciatura_unam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa59f28-fd6f-49e9-a25a-87a2bb632e8a/bazusakowiwe.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_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 5848 bytes
SHA-256: d89e326c244e52f121483880fa828f456c73b370074ea15278e6189780f65655
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 10732 bytes
SHA-256: e8f241bc57b3de9a9f79baf87a1d92cd59d6203fdad4882b83144269e14094aa

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