Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2dd7042ab901a8…

MALICIOUS

PDF

75.7 KB Created: 2021-04-06 17:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6e7d5467009a7d7e99a1921cb0ec6a11 SHA-1: 263049bc8be21b634f97b81d7db53b30913a3199 SHA-256: bc2dd7042ab901a8c5bf6389f9d2789a4a1d6282c4b92f1c336f1aee5067ae5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/award?keyword=blokus+rules+pdf PDF link annotation
    • http://detonic-buy.website/american_truck_simulator_free_download_for_ios57bys.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/is_gluten_free_best_for_dogszql3p.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/865330736777o3yg.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/809100.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/ravubefip.pdfIn PDF document text
    • https://luvisusarav.weebly.com/uploads/1/3/6/0/136011852/budubatukabamebilo.pdfIn PDF document text
    • https://libokitij.weebly.com/uploads/1/3/2/6/132681759/7368515.pdfIn PDF document text
    • http://xteenware.online/giorno_s_theme_saxophone_sheet_music17lnk.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/adverse_drug_reaction_monitoring.pdfIn PDF document text
    • http://psychologyrelax.xyz/25637662501ozsr2.pdfIn PDF document text
    • https://jedavosezinuli.weebly.com/uploads/1/3/1/4/131438835/2762908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_a77433ce21a0489a928583ef9042150e.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_41728a3ffe6848a0b27a227fcc53fa4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/wallpaper_girl_indian.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_09149c72bdaf4d47986b1bd8935d420d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/english_language_proficiency_thesis.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/kedojug.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/gakala.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_eb9602df60bc4577ad9ecb03c31779be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/81346428445.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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 4936 bytes
SHA-256: f27282186db55488cf56aa1a9fa52fe40c4b4d91e3b7a1f8bc94fc192ef0f2be
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 10988 bytes
SHA-256: 7de204f3e8349924a54695c2a21eaa57d7e5974758d4b14158239ecbb1b87389

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