Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d21c00a96e10f88…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 03:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 12f0fdc67cb2984261f7421793fed18b SHA-1: 33b4e7a52c4bcffd2ddc7b09a3f84336e5a417f0 SHA-256: 7d21c00a96e10f88e2a3d14ba1b428b94da3b58486d5cece3fae85249b0d35dc
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 0.9996

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://maypoin.ru/strik?utm_term=how+do+i+reset+my+keurig+after+power+outage PDF link annotation
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/jatigudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fd1bcbb13acd.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/rode_stereo_videomic_pro_rycote_review.pdfIn PDF document text
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/7fd588d3.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/datoregavutip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6047bb3f93b25.pdfIn PDF document text
    • https://jakakatis.weebly.com/uploads/1/3/5/3/135323185/f1abd68e384f.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/nesalenejokekazeweji.pdfIn PDF document text
    • https://goguzosuv.weebly.com/uploads/1/3/5/3/135343726/tebubotopevemeset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6032cb09f2954.pdfIn PDF document text
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/xukutoliwirodewojix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_4271167f199a4f75bbfbff5ff8b7ebd9.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_173dacb9d7984f62b76722825863c03d.pdf?index=trueIn PDF document text
    • http://jufofokisib.epizy.com/bacteriuria_asintomatica_adultos.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_e3dded88c8554debbb3b942bd60bbe28.pdf?index=trueIn PDF document text
    • http://pofulexurukuka.rf.gd/12061829791.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_d3b8e81fba29404cb7819a054fd2a32f.pdf?index=trueIn PDF document text
    • http://mezuvisudaduvo.epizy.com/serusulatasagedeki.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/tree_of_life_back_tattoo_ideas.pdfIn PDF document text
    • http://sosefamip.epizy.com/vejotafanibawesixebiv.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_ec4f8c24455d438d946fdcf5cc6106ba.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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 5548 bytes
SHA-256: 6d827b8f255264e5dbb4d17bfe79452b284c217269b69e483e38e092ab1a268e
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10752 bytes
SHA-256: 4498a5d03a21aa368df4441e14ab3e64c164c45030cf1c2e72d72235d183aab9

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