Malicious PDF — malware analysis report

Static analysis result for SHA-256 225be3d21990f20f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68799ac507108393ab97bd749e3da915 SHA-1: 9e90e473d62b91dfb1f015aa4b838584c52e984b SHA-256: 225be3d21990f20f535c5618c35d52a17994fff196517c7e79bddbd67be843c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings suggest the PDF acts as a link farm, directing users to numerous external websites, some of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://dbcasagayathottam.org/assets/uploads/cms_images/files/desuvoferesajinakoxevo.pdf In PDF document text
    • http://uklearningnetwork.com/userfiles/file/29491259734.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qf3635hhle47sagsh65duub567/ralobawaduxulubojoxopata.pdfIn PDF document text
    • http://cityfate.com/files/files/65644664691.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/63554808968.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/mebudabupegenofebobilane.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/filorokax.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/59942657971.pdfIn PDF document text
    • https://atrax.hr/files/togid.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091622283973499.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910163835.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/goputodefulapafo.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/jaxebosaditawi.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109020731333552.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/jixazotosabaxakigox.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/kewugefolebivirojatores.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dubipenedanuvuvewor.pdfIn PDF document text
    • http://jcpingie.be/public/files/fuxag.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/64362198234.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88739071646.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/63449658569.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16131588196ba8---lojoganibefub.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/73050712521.pdfIn PDF document text
    • http://www.andreapondika.cz/file/18357224509.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/95768848925.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/020f58c6e4e878adfecb28d1bf581dbc.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=playstation+1+iso+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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 15952 bytes
SHA-256: 9a4b858a6243c049a338a69e3a841019031fc759c6e0c1dad3acb50cb36927fc
font_02_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10264 bytes
SHA-256: 613b3469d09c573d426e0b43b09850d47986512ec01d33c41d03d796a6a16495