Malicious PDF — malware analysis report

Static analysis result for SHA-256 a319aee4d78e6354…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 05:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f9a078acfe5d6eec4e26cced0eb73c7 SHA-1: 924ac2ce5c4e4b879bfebdc5895e24d72ed953f6 SHA-256: a319aee4d78e63549cb76dcb5fcc5016baa29c4d839683acc26a9db6e05ee756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external URIs and is structured as a link farm, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5d40e2724088fb6a4e166aa341bc0c19/mevawugosufibizet.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/dupowibozomugofifukajuso.pdfIn PDF document text
    • http://teplospectr.ru/images/files/60216175202.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/pufosepe.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/72982387203.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210910044728_396016397.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd882da449---51428098686.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/31179454789.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/75034192333.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70558977534.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/punejojapanizo.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/wutiliwunu.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/58213555982.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/75841969841.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/55808307632.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/masazakumivipupovejam.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109200648054345.pdfIn PDF document text
    • http://xfswchem.com/upload/files/85833250791.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/kinomuv.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/20537518197.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/41315874083.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/pexirozukamusisomotimebek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=caram+bot+game+apkPDF 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_off0000ba25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 17008 bytes
SHA-256: 2e59f0fc0d4e5ba579527bd3e03fc07765af8b5c0f297c16fb4a696e49b40a98
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10448 bytes
SHA-256: 8efb8caec3ea8515c4f73454dc32d656daabe0692c7dc3e2091c50bba15672dc

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