Malicious PDF — malware analysis report

Static analysis result for SHA-256 125aa088111dcc1b…

MALICIOUS

PDF

75.9 KB Created: 2021-05-09 04:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 658eefd9089eba6be26f101367b85f9f SHA-1: 8cb3ff31b321a64af8f5c06e67b113e075f51ed0 SHA-256: 125aa088111dcc1b0fdafe1c6a95fec26a5e675ecd76ed2ad64095d42b3f4413
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://lozipotod.ru/strik?utm_term=master+of+orion+cheat+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6056f2790e791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_60623650aca16.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/62294538680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fe0622aa81b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5fe31b89be9aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c01a025c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6048ec3789bfe.pdfIn PDF document text
    • http://janexik.22web.org/poxazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_6008c015063be.pdfIn PDF document text
    • http://xagabovano.22web.org/zijatifisumuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605e005b5cbec.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/17044153183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_8a0bff2db60040168457d727346e9e12.pdf?index=trueIn PDF document text
    • http://varupijijajeb.rf.gd/51145217604.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/joseph_prince_church_location_singapore.pdfIn PDF document text
    • http://nerusejide.rf.gd/83551284685.pdfIn PDF document text
    • http://piruxogijuba.rf.gd/76690770233.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_fbf72dbf83104136a62bb992cbc43133.pdf?index=trueIn 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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5080 bytes
SHA-256: d562160425fd5c3dffeb177100f07d95093acab98c425d2c3688e42fced019dd
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 11656 bytes
SHA-256: c2be873f182a8a54979ee68b29e60b499f4a7d8937bac9ecba5d49b7431d5f7d

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