Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0d41b93b07c177…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 14:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08fc778e9d2a9d14a9a6aa1306ea8a5a SHA-1: 818c530b5b7b141c1d47587434dac7ef6ee49786 SHA-256: 5d0d41b93b07c17725c8aa670609b0ad838365d6b4480ebb8dee8f8c7e01ec5c
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pensjonatagat.pl/userfiles/file/begasa.pdf In PDF document text
    • https://alrukn.co/userfiles/files/jaranoxedelukivoxulit.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/gojufuka.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/wurujen.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/gaxumifufonokebabomala.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/19620689345.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/direpeminuxa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/13737120836.pdfIn PDF document text
    • https://izr.fr/files/nujibogirelipomevulu.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/16806844844.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xanoridagebixone.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/vegetizudajekidasarujebit.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/jujukakovosugep.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24395317882.pdfIn PDF document text
    • http://kco.su/userfiles/file/81889322648.pdfIn PDF document text
    • https://plasy.com/uploads/file/kesaloxo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/74981767097.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613752ef6f68b---87701681271.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109012315038895.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bbk7iu822gedq1hbc6kgc13lp7/62677431369.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jiwisuge.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/zuwafixujakagafuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+market+2008PDF 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_off0000af63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF63 14684 bytes
SHA-256: 6ba879a79a04d9fef66cbfa4dbd31b07d060e8aaf3461d8bcc6f75b29c8e9e02
font_01_sfnt_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 10720 bytes
SHA-256: f5695c08c59b0b251a6b6520f536d0f1f454fc8c4f564b4be9b360604e3c52cd
font_02_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1