Malicious PDF — malware analysis report

Static analysis result for SHA-256 8733f57532fe4a6f…

MALICIOUS

PDF

71.6 KB Created: 2021-03-31 03:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d38509f0f64d67c1f3c98de578da9cd SHA-1: f24ec0f09c80b4f4c0790112b3da20a500ea41cf SHA-256: 8733f57532fe4a6f53c504be316d9a1ff1e535b4c60a48063aaeec496f1f918d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=athearn+blue+box+sd40-2 PDF link annotation
    • http://good-production16.site/544476318071l8of.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/kannada_barakhadi_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/a3gdmJX/56074882576.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/gixukizezagabo.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/13624223572.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/ashcroft_gauges.pdfIn PDF document text
    • https://cdn.sqhk.co/samuxoruja/AYghThe/88888883376.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/BjjTmhf/shaolin_kung_fu_training_center_in_kolkata.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/general_chemistry_atomic_structure.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/69685110063.pdfIn PDF document text
    • http://optarfes.com/1655318283206x0g.pdfIn PDF document text
    • http://bighome.space/gagimifososimuso5a460.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/36819955608.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/dogegajupa.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/manual_de_imagen_corporativa_ejemplos2927c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_e8ae9c9e18df4f4f9d464f90d1acc0b0.pdf?index=trueIn PDF document text
    • http://ligekasuxube.onlinewebshop.net/40371002797.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b0618b78f3c842e99644c44ebe62399b.pdf?index=trueIn PDF document text
    • http://dezinolabebosod.atwebpages.com/titan_impact_440_pump_filter.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/nawunawefulewaw.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/21604631305.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_28e8d7e507c349a6ac51571c9adc895e.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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 5504 bytes
SHA-256: 42317fb08df06702e6aa6685fac85e0408a23f6b26f0cb8822de1a2ed8958cd8
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10404 bytes
SHA-256: 0d77eab794ed026863f20c409a33bc40eff19509e421e4084afcf248f059f942

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