Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c4a38cffe41861…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d44031e91ad917c549e6ec57511af3c SHA-1: bf2e5fff0b871cda8b2102e3b712577a6fa9b0d5 SHA-256: 86c4a38cffe4186175cf404cb6e61652a2090ec44ce31cad3da7cc6df345ad68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://insureavisitor.com/userfiles/file/32265242215.pdf In PDF document text
    • http://grandp.ru/userfiles/file/93138404923.pdfIn PDF document text
    • https://pokereshop.cz/data/file/12290812861.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mimaxerejonapavanalusufe.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/34725002665.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/juboxetisusowivuzolajuze.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/68437924216.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/66712255872.pdfIn PDF document text
    • http://carbontuning.ru/file/jinez.pdfIn PDF document text
    • https://porfic.com/fotos/file/87249073947.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/286592782e1d1011a032a78980dd717d/tajebodalok.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pugogamaniduwuvaweku.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zoxujudobabeputob.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sadewokuwivupafe.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tadekefajoriretumu.pdfIn PDF document text
    • http://client.diffuse.info/files/dusexunalatamideripajexa.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/weladozobu.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/63108095189.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/tikupigemuwi.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/dusewarijadezotofa.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/wunilofizekiruvawoxowa.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gisizawawa.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/15947218788.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/6399901957.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/nukafixit.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/53102101626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=is+inside+a+prepositionPDF 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_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 18616 bytes
SHA-256: 6552cf85825c81bd5981ba2c8f70b8b86fc6c1cd81bd73bf6f9bf4444acf1c6d
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 10288 bytes
SHA-256: b7edb89b9921c6dd7fc711827986a019963ab955b119a8bd4a5f49ecfb521983

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