Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1273db667bdb90…

MALICIOUS

PDF

88.1 KB Created: 2021-03-22 13:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d70b09c3f48e91fc754fbfe00ee96d3 SHA-1: 5abd53b0c8e87d7cebb356506644459ff29dfad2 SHA-256: fc1273db667bdb907141cb7f8575d778847d8ebd27919def8040a728f4935a29
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=personal+budget+template+nz PDF link annotation
    • http://xatovapotogu.mywebcommunity.org/whos_afraid_of_virginia_woolf.pdfIn PDF document text
    • https://zomurigokolu.weebly.com/uploads/1/3/1/4/131437535/vakuminuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_6018633937ed4.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/xogitav_fizemezutora.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/933e46582.pdfIn PDF document text
    • https://janunawavi.weebly.com/uploads/1/3/4/3/134314220/wapafivisiralaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc76f4c2a083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fc9b681cfc51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_6020b8fc06283.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/tecnicas_de_presupuesto_de_capital.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_603dec7884b86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_6024ce8eacb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_60241ef91be5e.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/poguvelefa/company_store_split_king_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/wukapalevugoperokitod.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/10678487658.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/google_docs_change_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/ledudubedunun.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/alouette_song_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/77322880286.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_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 5472 bytes
SHA-256: b2810445b586a5c084ad9381cd531e08b6cb86e96882a33667962184a942aae7
font_01_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 11356 bytes
SHA-256: 6e2d234e32fee5b7669b3138e7da04281c9f0af3da92c28c0a0f8695bac0e5d7

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