Malicious PDF — malware analysis report

Static analysis result for SHA-256 1116989c99b1749e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 16:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 612289677e2756357888754d7dc37bec SHA-1: a5c43ddcd3f1cf297f4008fdcf92e77026701f19 SHA-256: 1116989c99b1749e0ed3717ff66571d92208bbca1ad3a18863c4e332104aca0a
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute additional malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chelseafoodmart.com/uploads/files/pivazofenu.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15f0e6aea---venututarusovaride.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/piwepil.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/guvofazexelajaweno.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wenawilox.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/nunaxedibafoxemo.pdfIn PDF document text
    • https://bczenekar.hu/files/file/60298814252.pdfIn PDF document text
    • http://healthywithhart.com/res/file/40483658800.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/74898677887.pdfIn PDF document text
    • http://dobermanncz.eu/files/nedenoduwujixonoma.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/gugaret.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/65357066742.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/49168160624.pdfIn PDF document text
    • http://eternoohydro.com/d/files/20865620705.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/3773992328.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/juzenodigikuwapi.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/16976576524.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/42ad365d48fb9ccc482977a8303564c1/memopoxotexivil.pdfIn PDF document text
    • http://airmon.hu/images/files/49422097547.pdfIn PDF document text
    • http://usmleworkout.com/files/file/75795258662.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/sebizenapobepusejigidokiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+email+app+keeps+closingPDF 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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 10832 bytes
SHA-256: f398d4762502ec51062a782bcff4ef19ab58c27dd7f00520f0192f6045f5ef51
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 17280 bytes
SHA-256: c4724a19df9ce67f5d59eb9bed355f07afe722723fb1142f541b1da2cf0beacb

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