Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cfe0ec62107fb2…

MALICIOUS

PDF

101.6 KB Created: 2021-09-12 18:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 790eba38c5c4b124b53bcbf820fd53dd SHA-1: 40d5fa55f3c63a5e251b98d52fed1948f5a2b855 SHA-256: 37cfe0ec62107fb2f1bb178f4ed3718348d44262408884f57908bf5f45973cba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains, indicates a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://silatur.com/js/ckfinder/userfiles/files/23009050299.pdf In PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/15092930323.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/72536276280.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/waxividixabap.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/54266462424.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/16347216816.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/bivuna.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mutinimoxamavoberudo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sosedimujemezovuwusezosuw.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/31065826457.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134843f1941f---tumezamimapol.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/67455706164.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-08/images/files/nasifa.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/37369327979.pdfIn PDF document text
    • https://grancom.by/upload/docs/juxopefoxuvazifixi.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/17682727400.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/jigisogezuzugoxit.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zebizivexikilefiwudo.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/gufosi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/kurevitap.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv1mufgoddi9ejt77m8o0jf580/30440173832.pdfIn PDF document text
    • http://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/binonibakupedav.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109101417413559.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/wuvudiwodo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/venaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mmpi+2+questions+pdfPDF 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_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 18124 bytes
SHA-256: dd59cd2529ec87eeee7b0464327fa8dffb2a3047605311c83e9c50420f7d2e8f
font_01_sfnt_off00015836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15836 10712 bytes
SHA-256: cdcc1391a115c08d9b0d83fc8acb8e46f8d89a0c6873133b3661d7c4bc9e7107
font_02_sfnt_off000170a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1