Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae8bd12aa603d6c…

MALICIOUS

PDF

95.0 KB Created: 2021-05-16 18:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cbfcfe300d14dd5b05ce8e1137910d8 SHA-1: 7499394141c5f5a84cce4ec88a214014f39521ec SHA-256: 4ae8bd12aa603d6cc082723ec8ef77cc6e1796628e961f9ee7b0428e5bf877b7
156 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 of which are to seemingly unrelated topics, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://xajibur.ru/strik?utm_term=which+carbonated+water+maker+is+the+best PDF link annotation
    • http://clientbluebadge.com/what_does_ti_amo_mean_in_englishvnmhy.pdfIn PDF document text
    • http://idealicaitaly.site/euromodelismo_descargar_gratisabsaa.pdfIn PDF document text
    • http://boost-shop.xyz/207439191460ny67.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/d958c4f862.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/177f89.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/c8e6b68ac.pdfIn PDF document text
    • http://reetodo.online/migikiretijuxifemigowamez80qf.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/e02996c1c4e3.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/81762a667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidenigad/best_human_trafficking_movies_on_netflix.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_5db32ddd9eba47fba07515aa90a83693.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c2585d8c876d4043b6aa227c7adea887.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/18040687286.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_e7b33488d35f49e69f11acd3c02b3458.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/jcpenney_deluxe_sewing_machine_6976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1157ce4-e009-46cd-b1da-272f27877b61/77085469883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af640ed8-5512-4ad6-9059-67f576c5b3fe/zovufaruja.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/67272339740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edc63c5-a20d-4ab8-825c-2b0fa1f5497d/how_to_reset_the_motorola_phone.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_59a29d50260c42f492e8b21c5879055c.pdf?index=trueIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_066e335a7ed944f0a88ff0594451cc8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/riesgos_laborales_fisicos.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/19104264904.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/97873013424.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/kevalupexule.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_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 5456 bytes
SHA-256: 51d48237db6466045c1d6726fbff1fb00f8eadbe27a30f4e40a4e03bc19e6fcc
font_01_sfnt_off0001495b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495B 10988 bytes
SHA-256: 837fd6c645f3a64c11816c26186b778dcc4d82912eb791d656d8f1a7cf66dabe

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