Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffb73f6db98133f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 10:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5570ad41c4c097ed4500d177d4a32f86 SHA-1: 949a4ca40ac0231144d3d452f15b4260a8262361 SHA-256: fffb73f6db98133f229c866b0ea19cd0de059816ea5786f1d337b10b6033dee6
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+does+william+afton+sound+like PDF link annotation
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/togazetarezevug.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/77699275767.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/pablo_neruda_quotes_goodreads.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/vewejibere.pdfIn PDF document text
    • http://icily.xyz/fishing_tour_guide_salary8detu.pdfIn PDF document text
    • http://bighome.space/what_lenses_are_compatible_with_nikon_d610i4ynw.pdfIn PDF document text
    • http://getallcreditscores.info/tupexoguwaxelimatokzsymt.pdfIn PDF document text
    • https://nexiwurepefisov.weebly.com/uploads/1/3/4/3/134372078/pufona.pdfIn PDF document text
    • http://carins.info/93558038396txsz1.pdfIn PDF document text
    • http://fedajoxoxa.iblogger.org/development_economics_theory_and_practice_1st_edition.pdfIn PDF document text
    • http://my-favshope.online/is_the_shining_a_true_storyoc5gj.pdfIn PDF document text
    • http://jebumivusesujan.iblogger.org/calista_luxury_resort_fact_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likitaponuviv.rf.gd/jevabozebigoxo.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/is_it_hard_to_pledge_delta_sigma_theta.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_394cb4cc44c948878a556e167177cb97.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_c79a48720b4e4f74a712de48102e5020.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_92ae2c9e5b3c4f6f8541916f222a6dad.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_dcb5f2ef93124171af915ca23af6eef6.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/zagupameviterulufudotef.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/dok_levels_of_common_core_standards.pdfIn PDF document text
    • http://widusop.atwebpages.com/42510377320.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/23089852968.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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 5220 bytes
SHA-256: 464cfbdb0fed1a5c3951b68fada1bf712bbc47cbbbb99cf478f0be7d45669b39
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 10580 bytes
SHA-256: 1589e4440f14520179fe41333fbc5a5a55576ddc7e964f1e737ec9177ee68727

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