Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e37e513b1b5e24…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 12:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7795fd7c0f5fc85bf5057d590aacbb99 SHA-1: db75f2f3b1c6f3bacf4d770b9fb91ed499674d0b SHA-256: 58e37e513b1b5e24be4bf16be4cacadd34b60bed736a6514c8482efeeb12ddcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of multiple PDF links and the overall heuristic firings indicate an attempt to direct the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7843791f5---lesatuzokadajavawoje.pdf In PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/pasusujed.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fizupo.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/rubekukegetigasiribetodo.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jubirejakixer.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/zixejogadajareripipakuw.pdfIn PDF document text
    • http://rurisnet.org/images/file/vobineliluteb.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xotix.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/72385537966.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74099683480.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/71701146621.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/porenugu.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/voduvapem.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/widelubikorukulumad.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9a3db893---90557810994.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916012143126597.pdfIn PDF document text
    • http://htwy.com/upload/file/jomezevorexaserubepoveru.pdfIn PDF document text
    • http://benly-carson.com/product/files/tezatovop.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/zebubinabage.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/1779256619.pdfIn PDF document text
    • http://domuran.pl/files/file/zupuv.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/todetiziximaru.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/83294425007.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sotisenufupefitixax.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/vuviko.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/mijitagiboxewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=insulting+words+that+start+with+rPDF 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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10532 bytes
SHA-256: bab4bff756d1c09af929b3a88d695ac54356f465ca3eb668b5a0140f64942924
font_02_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 17860 bytes
SHA-256: 8f5f675c0cde92dadec1dcb34d17c99c97d0d45a5a230b749951f361544d401f