Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec70f6db6d3248f1…

MALICIOUS

PDF

95.3 KB Created: 2021-05-20 15:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 833d2fdd45cadb5c451bc3034c6dd909 SHA-1: 240c13eb057b0afab36cdd2660e545fc66083867 SHA-256: ec70f6db6d3248f162a37949907b6a613a90e81a5314aca24c084c8701a00414
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to benign-looking PDFs, but one prominent URL leads to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest an attempt to create a link farm for SEO manipulation or to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/strik?utm_term=anno+2070+mission+1+bug+reloaded PDF link annotation
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/cc6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500199/normal_6024cde6ce9ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_6001217a37610.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/bupigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_60388ca6d96cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5feed915a7c95.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/b44be80637bdbd.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/8451150.pdfIn PDF document text
    • https://nupanirofedodav.weebly.com/uploads/1/3/4/4/134470916/lumaduf-vugajel.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/latiwo_ruxabolofoguku_tomewimowopedod.pdfIn PDF document text
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/4caffa2156.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/gotenukevepunin/comparative_superlative_adjectives_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/15262134426.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/vameb.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/63368173076.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/unicorn_masked_singer_performance_episode_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/request_letter_format_for_adding_authorised_signatory.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/dojizozomivibikoru.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/32334259690.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_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 5680 bytes
SHA-256: e9a9225f3961662152f9f12bd28568b7988595e615d45299022f253994a0ed7f
font_01_sfnt_off000144f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F1 12876 bytes
SHA-256: bbfe9c70bc362abee92e326363e059a9e59f2cec5edf9fd46c159caccec14a44

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