Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef61949df0fda58…

MALICIOUS

PDF

95.8 KB Created: 2021-03-21 03:17:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4ba2ec7ebff712809470348eb649356f SHA-1: 1251b7be4ec6b6cb65c03dc65597d412f10b535c SHA-256: 6ef61949df0fda589dd05a38fa32d9cac910e889dfc27747fbebcb4b635aace4
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 0.9997

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://mezovuduw.ru/aws?utm_term=easy+ukulele+songs+for+beginners+chords+pdf PDF link annotation
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/luredupagilos_vijakejadap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fe8e7ee2bd3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5febb4c980b0e.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/ruger_lcp_2_.22_reviewsd7doy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_6032161e68fab.pdfIn PDF document text
    • http://theraisins.pro/how_to_troubleshoot_air_conditioner_not_turning_on6m5f9.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/mowiruxu2hcji.pdfIn PDF document text
    • https://xadixolikiz.weebly.com/uploads/1/3/1/3/131380305/tanigipinat-basejavuxes-tufipis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_600f20becac8c.pdfIn PDF document text
    • https://wafifeberir.weebly.com/uploads/1/3/2/6/132682897/6171478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_6050611263700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_a36434e30dc44edd80abbb8cdc89fce3.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_e2292e125abd46f0893182959c570fbb.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_5a746807f0f44f358d3de9ea9adfc26b.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_da1bd3988d1348a7a8631dbb4fbc42bc.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_af81e999b90043e584543e61a4085bf0.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_791870b520ff4b1ba2c0cd501a4bbd0d.pdf?index=trueIn PDF document text
    • http://lojuwuwa.rf.gd/zuromevokabakuvi.pdfIn PDF document text
    • http://mukokulag.epizy.com/pevoxiram.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_9b361df73ab44a1aa3be12016ff1c4c3.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_off0001354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 5680 bytes
SHA-256: a871e58e1d390cd51507df246c32bf5f308cc992c9674b68c1cca1b7e3602db3
font_01_sfnt_off000148a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A4 11388 bytes
SHA-256: bdeae7e53cb231e418a5e4eaf95bf229fa8b8585e81e8f19567e10326f1b7455

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