Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7b945b07cc8ead…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 09:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ead1cca13c3c6cf8fe61263e7c71742 SHA-1: 0894f301d23c7df82d23025982443ad6e408119b SHA-256: 3a7b945b07cc8ead2f3c4b5102b430dcec147979c9b87f4d712392c3af361f88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true malicious destination by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abpjse.news-read.com/upload/files/dagika.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfd94642a---1095160054.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/38214864934.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/80771770628.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/52141152834.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zedaziteligubeg.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zitasekokibozazonimij.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/94319399386.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/51198127432.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/tuwujotevos.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/xorojokogifen.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kimokubisedevine.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/42164313317.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/99623102370.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zubon.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/radetolimokenab.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/49834630173.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/pimeb.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131016c24b65---89426679110.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/49771878749.pdfIn PDF document text
    • http://rooptex.com/uploads/88521902537.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/timopavifineranidimegop.pdfIn PDF document text
    • http://willbramephotography.com/zubavudunipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+video+format+degistirmePDF 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16552 bytes
SHA-256: 4dc93644161b7f797eb3f3801b38365e5a86ac42a30e2ba709822de4c0832fe7
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 10700 bytes
SHA-256: 27eda1d1cd480ca3d9462a9e04368733990d9ca69c148bb667d9fa428b117cbf
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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