Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e493b210956997…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 10:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a93f811bfba8c0614a89bd8b047c254 SHA-1: 0a546bd05b51accaa7cb30ee23f02b4f601ff76c SHA-256: 89e493b210956997e6d81b8037bc50bde60e0cf1957908a05ab05e1a6a473461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to direct users to a network of potentially malicious websites. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kfmaccounting.com/webroot/img/content/files/mowolazaxiwaxuj.pdf In PDF document text
    • https://aspit.ro/imagini_ws/jowaxowoxavebopefutad.pdfIn PDF document text
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/godekolojegopates.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/33809035082.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/91640013118.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosejowedu.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/50864883619.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc47d27f0---8845614105.pdfIn PDF document text
    • https://ebooksweb.net/files/file/28451983909.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/26477733310.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/75143571851.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/bosijix.pdfIn PDF document text
    • http://candientuvibra.com/images/file/kuxibiriperivikozozor.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/momoxa.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/94615624956.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/16765846682.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/tuxiguvipezasoj.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/12245907679.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/69268786317.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/64756264978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=macbook+linux+dual+bootPDF 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 16256 bytes
SHA-256: 90b68ca479b0a60dcf6fc6c4cadf93a46bdbda7f6ff9ce25d18b510d98234165
font_01_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 10388 bytes
SHA-256: 7b2809d366a5c7065e25b1cb5fd0fd66a4166125aa6597fa5b35d55cb17e3833
font_02_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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