Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2b2a38c6cc7f9d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98b77b12ea1a6a2b79ae041dabcaac19 SHA-1: 073cf22cd8233b2d72132582ad75db84852f0d45 SHA-256: 5c2b2a38c6cc7f9df12b1c0b03daedb3df95ec52884d7e9479e1336ecb90faa2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains a large number of external URLs, many of which are structured as disposable links, suggesting an attempt to redirect users to potentially harmful content. The presence of JavaScript indicates an intent to execute code within the PDF, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://homeopathyhongkong.org/files/miwazuxoredogiriridut.pdf In PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/16287082754.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/93088650256.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/wuxonepadebutamimigusum.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/11525700472.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/10565819082.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/zazarinuvagokej.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/83549201457.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2de748cca---76503061108.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/dunumaximiduzovujewolaw.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/64318590779.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/6229660910.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/nubulofudaxuxudamitexoxip.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gelomagativipuxadamud.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/67731733395.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/nakegazofolarugujakonab.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lobolenofovufiwomaj.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/46404746062.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/panorapekewazusijuzufapet.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/201380823.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/39176483974.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/parumibabofomejugoda.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fd7cc2f9---defezunugibasodenur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pes+on+ppssppPDF 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_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 9748 bytes
SHA-256: f796a9b897b47f545506cb1631bcb5e0eea808a773d245a898c0da2213eb1291
font_02_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 19856 bytes
SHA-256: c00eccd5bae4430a66351ed25f0192476f1d0d6fb3ac51e335a3f8cea2527f3d