Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a89fdc9cd3db77…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7aaaa5e1193909b575bda2429d3049a8 SHA-1: 594622d9166d528b6683b2fad29ac481428d89be SHA-256: e9a89fdc9cd3db77fd7e5f030e09e1212466ed35e24786574b08471f73b121a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.aaptuk.org/ckfinder/userfiles/files/34705362011.pdf In PDF document text
    • http://tareeapartment.com/user_img/files/zuvijodaxerubagexakuwiv.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/giwiwunirabediwer.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73340578243.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/zejutitudesasozizikeru.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vigarif.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/gugunetubixazunepewagenub.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/xusevubuw.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/50318221494.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sebamuwa.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/javibaxofijabodopuvetuber.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cac5d9e8b5d6c1b57ea1b749d9e6cc12/mapuselajivinilikuko.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/kumisiwobaxonusaleruwave.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/10862017730.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/venosexanomimez.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380a4bc3b71---29030379687.pdfIn PDF document text
    • https://blugarden.eu/file/18667176901.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/34687888084.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lovusaxedewijo.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/65964251116.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/didifugunizijulatil.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/81490879428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+app+from+phone+to+smart+tvPDF 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 18612 bytes
SHA-256: 229f3f8cf60396a917a8e7516b9220e141123b7fe8f10a462534bcba52435aa5
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 10628 bytes
SHA-256: 2ba1fd98e1647b3f35752d9170902f1ec0c8aa8b64220cd2e95fd29ed6658a04

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