Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbae1a0db5e925b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 23:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e48c643a9693b9fdf02a982310378451 SHA-1: a29c7d51cafae86728f523cef249070daacbdbc5 SHA-256: efbae1a0db5e925b00e5a4c2a3e3308f0b62b29320ae5ab7b7fc3aacb9697c27
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The embedded URL `https://leonvi.ru/wix?keyword=i+hate+living+with+my+parents+yahoo+answers` is a primary indicator of this malicious activity, likely serving as a lure to a phishing site or a download host. The PDF structure and heuristics suggest it's designed to exploit users through deceptive links.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/wix?keyword=i+hate+living+with+my+parents+yahoo+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366665/normal_6046bf32d1b99.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/what_supply_chain_certification_is_best.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_600d267d41dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_601a47d1a8cd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60375bbb7b471.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/penyebab_bronkopneumonia_pada_anak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_60041bdf8626f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_605d79e0df0f1.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/xujitezu/lokavexekivesazug.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/mejuwun.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/13267772069.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/2014_volkswagen_jetta_sportwagen_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75216b16-70ce-4e26-8110-2b2851b08990/2007_ford_f250_diesel_maintenance_schedule.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/math_worksheets_for_kindergarten.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/best_java_books_for_beginners_2020.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/70988765110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ccb3d8-e43d-49b4-aeeb-29bc1a878ce2/beturunidipu.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 5424 bytes
SHA-256: 58b1433beb4084635fbe113e971c941b5890daf747ba382ba2b696a51dfebd74
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 11328 bytes
SHA-256: b45b3a1023bc5ef4012d13ea3e90c39db7143acd14dc8e1a499f2750d610f7a5

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