Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb258209f661d80f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 21:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10703cee1df1686d25cf2d8908173266 SHA-1: 3c48391892a2daf5a4472692b78b7b1fd04385e9 SHA-256: cb258209f661d80fcf4abc62d381b58cc78827eeebc5cede3387466b8c308f2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external URIs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs suggests the document is designed to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=minecraft+apk+apk+vision PDF link annotation
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918101014606942.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/40032380721.pdfIn PDF document text
    • http://superazs.ru/images/news/file/70338501189.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/ziwebigar.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/64200193427.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e37423479---28259618968.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/18045046948.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/92722051321.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/83505098416.pdfIn PDF document text
    • http://tion.hu/upload/file/modopuxudafafedivuzewisuf.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xebevobopubufamawan.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/97068150211.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/75783055796.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/88395345108.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/71304264353.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/niniselunusiseti.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/1142506487.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/30072369540.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/45105267267.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wopusiruzu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71339169213.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/a0a6ial852cstmetbug00begbt/gexozezetutoxi.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fesamajedosap.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/49580463841.pdfIn PDF document text
    • 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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 17292 bytes
SHA-256: 97f551a285198d96481205e152c7e54f3feadd4caffbb2a05d05371713b31053
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10580 bytes
SHA-256: 064b50c20c9173e3094e6f30a8d9e097b1349cbf3c26fa69e718f1e4de2cde99
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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