Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba5ec0a71599cb1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 07:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebe8f07592eb4f2815af11fcbdf88e88 SHA-1: a033ba95fa6f120131770ac319a53331d3a8598f SHA-256: 9ba5ec0a71599cb15ade575437f8e13edd49e85ececd5987a0be51bd37f3f941
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured to appear as download links for files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially disposable domains, suggesting a link farm or spam campaign. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of many external URIs points towards a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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://lycee-elm.com/userfiles/file/pedazofamomubuwadijizo.pdf In PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/78866609397.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/sepabofewetaranogojal.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/jozevitofivaditere.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138610269b62---99706718141.pdfIn PDF document text
    • http://brlairport.com/images/file/kideduf.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/54834878382.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/17435294251.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/98950797361.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/jevegika.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/kopegufodaxajejuj.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/19384aec8088e43589a0630245058054.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mupomikopijebuwumobo.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/nupoganifuk.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xazivaloko.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nakaj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337b3cc7836---mulizi.pdfIn PDF document text
    • https://projetovm.com/uploads/files/56198386036.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/wowozobadorogotepapogal.pdfIn PDF document text
    • http://maulich.vn/attachment/files/73337577104.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/bomegomopo.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/gefepojewiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ikigai+pdf+free+downloadPDF 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_off0000af03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF03 10536 bytes
SHA-256: 8259f4b0aa66c4f3307d0800ef1cfae24cffdfb2f77d610c5942451392562770
font_01_sfnt_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 15704 bytes
SHA-256: df61e3a6a4e65742a5aa2b6663617bcab1104ff509c782c017c1db2a752665de

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