Malicious PDF — malware analysis report

Static analysis result for SHA-256 565f6c11d08f463d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b973e567258523360cf8a84dfe5915fc SHA-1: cab707d71b39379f37f60586e1497417e90ee01d SHA-256: 565f6c11d08f463dd0bffffdc6c3dd0c492747fca68349c11fa6e335b13bcb68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination or spread malicious links across many domains. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pepinieramontana.ro/ckfinder/userfiles/files/84717163298.pdf In PDF document text
    • https://stpm-sa.com/userfiles/file/27000450950.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf55937c0---5142247550.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9de5d66---tibedabubujukuzes.pdfIn PDF document text
    • https://0900107678.com/upload/file/56715335080.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907111603953786.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/voladunegivalovuxevegiral.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/57963090029.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/86169917384.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/pezavovux.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/bafizo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nejukotizukawab.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/30916077024.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/13628987342.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xetalipipifijadep.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f48de1a---denudinubesaki.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/dufiboxejekepep.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/36148306780.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/faxukerege.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zafamawidenazifobikesu.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/59007669385.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22528417094.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/zomoweludigadiwevifokatum.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/tobisisopijinabojix.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_FFE59D9EEF2C3534.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/xuguj.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/39841509290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+skins+in+fortnite+2021PDF 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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 10360 bytes
SHA-256: 1fef8fab743dad4ed7356aceccc3330f04cdb3aca36c98837e100db6febb0d53
font_02_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 15304 bytes
SHA-256: 59ff0e5f6835a6c1a4bb5e621775249525d50346534dd96b7eb5c808c4f706ae