Malicious PDF — malware analysis report

Static analysis result for SHA-256 97674e8118f0b62c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 09:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39a37dea9f31f91589c679872d907593 SHA-1: 60186297868eb852b48c09451fee7033ba3675b3 SHA-256: 97674e8118f0b62cabb6046f079799f94ddfc6dcaf60e7e6441e9521a9005ac5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mmsmarin.com/imgimage/file/70226895322.pdf In PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/42752925086.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4cc77024c673fe40d3cdf59b55a8225c/79332762815.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/57663505709.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/bidase.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/11897254935.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_2D0BF505425AEEEF.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/xularovikafisove.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/87072342596.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89959744016.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/34912152078.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/rukevatikivefurezivi.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/20151999835.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tikujodepijududelebig.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5d99ec6228ee11f4dfeec0a13ab12715/lazenugomogomo.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/sozipixorisani.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weniziwijokosudutixotab.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/zajisexiwaga.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909094458.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/13563884732.pdfIn PDF document text
    • http://umhouses.com/uploads/files/ralaruxifotagiteruken.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sozeserivugavulefopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chess+engine+for+androidPDF 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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10520 bytes
SHA-256: 1f4cb4161e636732f7bb4a9b2bba44b8a493b0879b9e547c4d756c3eb625436a
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 18684 bytes
SHA-256: 16c88eccbbab8a4b3843aa25d9c7d066604f48b836a27484b6a555bf2e0011db

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