Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dff94cbb91109fd…

MALICIOUS

PDF

140.4 KB Created: 2021-03-25 00:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8aacc8339fc83da44a8476fe4e0d9ed7 SHA-1: 24a77fb31b7843ced26d36098df2e93e388c77a2 SHA-256: 5dff94cbb91109fd2528707a476f1c193baeed745b1d42705033988256da2895
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, and is flagged by multiple heuristics as a link farm and potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=arbitration+act+sri+lanka+pdf PDF link annotation
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/4635558.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/5752749.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/kevanolopugi.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/acfa9.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/kotulamofu.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/2438199.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/dinefotabetu_gapunotipok_kiribunozizov.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/jagelju/kindergarten_animals_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/agjthg0/i_love_my_planet_earth_essay.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/b220300.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63f3b980-df56-4d16-8c75-de9131d8e0d8.filesusr.com/ugd/b7fdcf_6592b2f051364e2c9623fa747e1b48f6.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_9439a555ae31432c97d349c30a246f91.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_d9c8484537754ad98613a4f7918c0907.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/113b530b-edb1-4d46-91e4-8bcbdcd4ef32/conceptos_de_derechos_humanos_y_sus_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/wobidajegesonamofif.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/b_p_m_full_form.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_3f54e6460bee4bfaa6f152acd214332e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/nosogirakanigameb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2da061-4dc6-44fc-947a-37cf01471c83/pixabexuwaxiposefuduguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18057a8-c244-4b68-b975-ca94982a9062/97626406348.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_889acd12ca164ccf92510ea7fe2d2c33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/manualidades_para_halloween_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953c43f9-d6e3-4365-9285-2b30bfae42aa/78254639671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7cb5e-95df-4979-9d66-12ee8d5d56a9/90937111150.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/85515684985.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_off0001e934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E934 5344 bytes
SHA-256: bc0387b66f4ff4dad3f61d69d280e1c9ce77d6ac1f02e81525559d71750fdb24
font_01_sfnt_off0001fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB6B 11696 bytes
SHA-256: a50f579e03826433de1cbc1483ee32b8a5a2e4b5adee88fd3577db6289a65f26

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