Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbfa56fc0d1bdf6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 20:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3fdf8487bd85b860ed45b299a03e990 SHA-1: 22e56003de40479a9bb8ccb4b385338b8acafb87 SHA-256: cfbfa56fc0d1bdf6ec22c262736727fbbea44e5d82c43cfcaad8544c4165890a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to external sites, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's part of a campaign to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yourownadviser.com/ckfinder/userfiles/files/54510275521.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wirewuvufabiziworu.pdfIn PDF document text
    • http://giga.sk/storage/file/11283633466.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/101708416743.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/94320847733.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gonebananozerufeduso.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/44733171478.pdfIn PDF document text
    • https://petala.gr/userfiles/file/93239814714.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/roxobalakajeligusimafezof.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/muzovitajafojulo.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/24383823768.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/bepijetupidipasenukogo.pdfIn PDF document text
    • http://ropesadventure.com/d/files/gejovovonelofip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff43512d6---59152516241.pdfIn PDF document text
    • https://olterus.com/contents/files/titazuzelosozoximinabimen.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/79629806599.pdfIn PDF document text
    • http://annabarons.lv/files/files/58607125831.pdfIn PDF document text
    • https://koratspring.com/upload/file/fifotamidu.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/33986628250.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/44305554940.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/babovozafigililowego.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/71da9a08ba481fc02f6493902ac1b78e/78791644161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+it+chapter+2+online+free+nowPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 10608 bytes
SHA-256: 42322bcf5f3a7d9a82cb92d19a358396a77995f061f7d48bb76eb5a521631257
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 17844 bytes
SHA-256: 09e4683be65793e7e2ef3971e2e5e5b7756e796dea0ebfbb5d98274f70fc53f0

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