Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4d956f0fe5936f…

MALICIOUS

PDF

84.1 KB Created: 2021-10-07 07:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d609fbf04fc3b01d79a7ff9b4f06e597 SHA-1: 1a428c7480f23941cf96e89f0fa279cabfd31157 SHA-256: 2d4d956f0fe5936f39fd15995adedd75b845f269494aec4f36f9464a65a254fa
174 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. It contains embedded JavaScript and multiple external links, some of which are flagged as part of a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. These elements suggest the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://land89.com/ckupload/files/4580572270.pdf In PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140503ac72c0---danigas.pdfIn PDF document text
    • https://naves.cz/res/file/43175290842.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vaxop.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/37320008131.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/86119796890.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/50432827532.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12508372538.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/10839662922.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/daxom.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/58706580653.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f894e272c8adedbdd7dc3d79b2fac114/vovolotewi.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/zefawunikerokimevabiso.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/57306852330.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nefan.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fetemavomoriluvut.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/36707631253.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/widotamute.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210909181418.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/motepogugugotekedos.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/44999971556.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pomebenufilejobuwitot.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210909_DF41A0A1A0E51909.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/15036736931.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/19051818798.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/detafanozujuniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=happy+valentine%27s+day+hd+imagesPDF 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 10824 bytes
SHA-256: 26fe989c262f5e1d5911501e3f6a2e339121374492e448f967ed4e6a48e02b05
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 18992 bytes
SHA-256: 44e21034652167304d2b9b45fcab44475ba3ff0a326992ad6722d4ec63963570
font_02_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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