Malicious PDF — malware analysis report

Static analysis result for SHA-256 472e7892fc17422f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 00:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4f641aa7555d776289feb06d7716996e SHA-1: c0c34f59811d2393c455a008f6382f992f289e83 SHA-256: 472e7892fc17422f67cee217e04ecf97911695df31f59e286b476595dbde7da2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://mmagame.com/userfiles/file/ranogapotifikol.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/dijizani.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/vubiwu.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/dejifabarosa.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vobujewatuwibavejixer.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/99813419194.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb144d3123---11009063475.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/74458055727.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jarepabaxa.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/90491918857.pdfIn PDF document text
    • http://cmtsport.com/pliki/jomozililolujeberoxenoda.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xomonamuzulironu.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/legamakoxasekesob.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jipokolinazexeji.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090528544706.pdfIn PDF document text
    • http://dothi.info/images/files/lakatolala.pdfIn PDF document text
    • http://rjt1.org/upload/files/laxonasikilulumuboti.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mugixuko.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/zenarexara.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/tudovedemegimufeket.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilutet.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/45298346372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=firmware+mxq+s805PDF 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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10676 bytes
SHA-256: 9b625add56cde1cfdbc794c6177bfabddee90b2e1416f02daddfb63210ed9b47
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 17492 bytes
SHA-256: 45db77907a18a933b254162eea248e5be5f410b361ec8ed4445d455b9ab3e9df

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