Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c06220512257b2…

MALICIOUS

PDF

74.3 KB Created: 2021-06-04 19:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ee1189c7e120275beb932fdb27c90ed8 SHA-1: f2d369a259a6714b547371773554eea0b9ca466d SHA-256: 88c06220512257b27115cc2133a39c3af64957e88860e5e2b300cbd61fbd3e7a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to its generation, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/pbw?utm_term=why+does+wisconsin+have+weird+city+names PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6057992bae1cf.pdfIn PDF document text
    • https://bokavijuporuxeb.weebly.com/uploads/1/3/3/9/133997451/bffd32766c.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/6168325.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/498948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_602657748ebf6.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/5106474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60623556bdea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_6034cb0e4748c.pdfIn PDF document text
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/93649ddcf9.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/8645552.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/levelajixogidekojuwe.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/6730723.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/6295236.pdfIn PDF document text
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/3847871.pdfIn PDF document text
    • https://fewibatu.weebly.com/uploads/1/3/4/6/134696711/zupiwugodup.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/2e293d2c-2b9a-4d08-886b-6bb73ecf4f08/5376492907.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/17432995762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56213c29-664e-4eb3-8877-8801676e260c/24401570224.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/f/tawojorejisujelipawugar.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/quickbooks_pro_2016_uk_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1710c5f-e2e5-42d8-93ed-8ab3849d5d92/zizotiwolorurefum.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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 5416 bytes
SHA-256: b9dff347b47a99fa5149014ee51c68822a46b078fb0b28b2af671d1159f5e168
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 10876 bytes
SHA-256: 3499121e767039c0c4ecf681a3ae948cef82fb17c2dad6c8eb1a052af3efc227