Malicious PDF — malware analysis report

Static analysis result for SHA-256 81742a66dea6d2be…

MALICIOUS

PDF

67.4 KB Created: 2021-02-24 01:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 744f71703cfefa484a8a26d76547f123 SHA-1: 5972bfea74e2d2b6c6e6072a1b83a7e6d33d46a9 SHA-256: 81742a66dea6d2bef9581db4027385716b947c21d22c565cfa3a9baff7387867
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to malicious URLs, specifically identified as a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL, https://baarspo.ru/strik?utm_term=printable+maths+worksheets+for+15+year+olds, is the primary indicator of the phishing lure.

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 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://baarspo.ru/strik?utm_term=printable+maths+worksheets+for+15+year+olds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489264/normal_5fd7cbd03c614.pdfIn PDF document text
    • http://skout.tech/99362869516g29hu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_60297d2337de0.pdfIn PDF document text
    • http://gachihyper.xyz/639717767976072x.pdfIn PDF document text
    • http://losmopaka.site/the_apple_never_falls_far_from_the_tree_movie_quote0e86r.pdfIn PDF document text
    • http://rewirujekinoxex.iblogger.org/16710370881.pdfIn PDF document text
    • http://kfcrabota.ru/milk_adulteration4u6to.pdfIn PDF document text
    • http://poopo.ru/5652643904414hg9.pdfIn PDF document text
    • http://esclick.pro/jexudidafumafurexaptuumb.pdfIn PDF document text
    • http://badgesverified.com/ayushman_bharat_yojana_list_download49fez.pdfIn PDF document text
    • http://cartest.pro/wondershare_filmora_tutorial95dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_6030448b9952a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepawelifebin.rf.gd/meram.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/jozopit.pdfIn PDF document text
    • http://toxoxizid.rf.gd/gifarofojurugu.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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 5724 bytes
SHA-256: 4c4a153de976b5e026b65dd5126f4ad621a5378daf9316ec5c9e2a488984af2d
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 10452 bytes
SHA-256: 0fc071efacbf0ae6af868cb96707b26f8c52a151045ee88043c17a39dbb57776

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