Malicious PDF — malware analysis report

Static analysis result for SHA-256 63de212bc78f0127…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 03:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef868f1e5c83b4bb2115d91b277540e5 SHA-1: aa787a0c31192e197c8251d1529a02bba69cac3f SHA-256: 63de212bc78f0127e2573ea8a44ca2f7ca0afa8c32aa63b110d4ea069e923e27
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript points to an execution vector, likely to download further payloads or redirect the user.

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://seasonsblinds.com/uploads/ckfinder/userfiles/files/safekixexupuxez.pdf In PDF document text
    • http://zulassungsservice4you.de/bilder/file/29407193477.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1072d8e1e---10929843482.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/41938563014.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/garuwojivap.pdfIn PDF document text
    • https://moolans.com/uploads/files/985279650.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/43284448994.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/25227366422.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/jifosoj.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/2617901152.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109050447156780.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ffb447336eec1c63fc600cc6e03a2591/wolovatumemitofifoku.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210910_150445.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/6630978938.pdfIn PDF document text
    • http://live-net.it/file/82944724581.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904051217.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pewadejurasumanoziredisi.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6134b8276730f.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/77774174035.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pedulesukiwerom.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/bewetevamekogubumotuzuz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kedowatozaririnolivilu.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/voxexapubujixusofaborera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=backup+android+phone+dataPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10644 bytes
SHA-256: 33e5eee79cb46da6ec6458decc4102dee57d732de9ab5758f98a1131eda243f2
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 17656 bytes
SHA-256: 7ccd260aeb9a4295ac8f2f5ae17c632a4a5a8fb9b9b90ce95c09f24d5ca47f60

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