Malicious PDF — malware analysis report

Static analysis result for SHA-256 81137ea294f899ad…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 04:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bc42121d5f1139b846aa12d0fa685e9 SHA-1: 608d72a18367a4328ed581745c8ddd3be830da84 SHA-256: 81137ea294f899adab16f1bf0f7de983a9b5be11f8afa8d5df6a1662b945d87d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many pointing to potentially disposable domains, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded JavaScript likely serves to obfuscate malicious activity or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 https://namratalakhotia.com/userfiles/files/pumuninekuxugemulu.pdf In PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/mibexij.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wiliwagorome.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/4435645840.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/98924491304.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/78877679493.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mulojejozosivupamotufemu.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/vepubakukipetenitep.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/9165513547.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/79rqbl69q15i6qnqk9rjinc7i8/89392230538.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/40699418965.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/85292346727.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/vafeparudutidejuj.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/13566299738.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/49022362573.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/mugomujoboxekalu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a7a50b51---xiteximupuja.pdfIn PDF document text
    • https://icbacademy.com/upload/files/48775511707.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109100715566307.pdfIn PDF document text
    • http://mobitransjogja.com/files/jomubipidetevaxisesovedi.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nigozugexavijitesujojusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=geocache+app+android+freePDF 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_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 17452 bytes
SHA-256: aaa325fb4f39bfa26e60116c57628c2a1a184c48f6f75b83c89eb01e832f8edc
font_01_sfnt_off000118fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 10444 bytes
SHA-256: 9535934a7c26e50455bdf875cf548c9b664ef4dbd6d8033bc4cf4cc6dc718000
font_02_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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