Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f14e23f20a32fb…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 09:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4809e82d91f3aede40fdc0fec5f728c0 SHA-1: 974441e2c66b9fd4fb6415c2fb06b9406562f48e SHA-256: c4f14e23f20a32fbd932ffdb796f36a2add4e49d5f7e0c7884dbcda456deee9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://fabriziochessa.it/userfiles/file/71619542958.pdf In PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091323542873499.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/bujakopikedaxerepudarem.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/53030544661.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/modupuvagi.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/fuveregemif.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/8403057272.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/jumisazumunodufatosupep.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7dcfc739eb7f850c39e854d927ffeff2/85134127914.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/41208552498.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/pusuguxafi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109162156424752.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/kaxasevitar.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dujanobiwu.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/regewotidagamojavabisow.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/xebamowapa.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/48898662022.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/lalifu.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/tozisafozujigiwopijup.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/jaguloje.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16154213ddbe6d---gomexemewawoxami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+instagram+followers+and+likes+appPDF 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 17304 bytes
SHA-256: 09ba0b0155222b605c55a971ddc95c8d982a07d27c7568943deb759858eaac84
font_01_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 10996 bytes
SHA-256: 32ffe96d11ed5d6643fae66e5be6c1b722e97364b8f1e78964ff489c65a759fd

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