Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7245760702fed6…

MALICIOUS

PDF

71.4 KB Created: 2021-03-15 03:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71a37c2c7723f8ccd646315157bf100a SHA-1: ac27eb5b1794afc1b02f6b83b3e79f39c753836b SHA-256: ba7245760702fed6ccb5c289f2f99c3daee39058bf0bcb2e48c8b09dfdeccd3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://dafemum.ru/strik?utm_term=2015+algebra+1+staar+released+test', is suspicious and likely leads to a phishing or malware distribution site. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=2015+algebra+1+staar+released+test
    • https://static.s123-cdn-static.com/uploads/4447431/normal_5fc756bc1ff6c.pdf
    • http://purpless.vip/kazizuwuriwogetaxixatazf1zav.pdf
    • https://cdn-cms.f-static.net/uploads/4422150/normal_6039038fa93b1.pdf
    • http://teenagetutor.net/synology_dlna_client_androidnrbod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woneketelak/65075526057.pdf
    • https://s3.amazonaws.com/limepusotanal/91231511960.pdf
    • https://uploads.strikinglycdn.com/files/5ff9ebc4-848e-4991-b387-9795a1927562/279716209.pdf
    • https://s3.amazonaws.com/pululusodogi/sheets_of_plywood_calculator.pdf
    • https://uploads.strikinglycdn.com/files/cfbe7dd0-5e2d-40a0-82e0-0be544e46922/college_essay_examples.pdf
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_6475bd51fa5a420babf964f9becf0173.pdf?index=true
    • https://s3.amazonaws.com/mavixu/cambridge_english_young_learners.pdf
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_228509ca9f2a42acaa18b4dbb23a001d.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_23a9ef69b9ee4857a104d9b4658c9cfc.pdf?index=true
    • https://s3.amazonaws.com/megulu/81842992221.pdf
    • https://uploads.strikinglycdn.com/files/c471ddce-320a-4da4-9b0b-2ea7370df2b0/panivobejowusakolide.pdf
    • https://s3.amazonaws.com/dibedamoka/gilezatanetebe.pdf
    • https://uploads.strikinglycdn.com/files/714d18d4-9677-447f-bff6-b46400943cda/are_penny_stocks_on_nasdaq.pdf
    • https://uploads.strikinglycdn.com/files/d8b8a49d-7b5b-439a-b2c3-996e5e644762/porifulibejidojape.pdf
    • https://s3.amazonaws.com/senodiw/75108102293.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_775a3ffe59234b51abafd80be6071615.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82b.bin
6da1861541c594fb3b20bc2633df4b25c38134e5a8c423e6624e178de4bc6618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 5488 bytes
font_01_sfnt_off0000ead9.bin
45076e54425cbb3b86b5427b2fb43e518646c6cd610633a3036f6dc2f9686ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 10468 bytes

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