Malicious PDF — malware analysis report

Static analysis result for SHA-256 54841611c78605f2…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 20:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbfd35ea9bf1bf4ff083f5d4132c6ab1 SHA-1: a62042a0a2d22f63d28df8701f381807939d64ac SHA-256: 54841611c78605f2b2d5b64da5f0ab73b2d5b8ec2e8c36a2340ad8a7bcafc862
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used in phishing campaigns to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://bisleriuber.genefied.co/ckfinder/userfiles/files/zemabiwasedakib.pdf In PDF document text
    • http://architectureanddesign.it/userfiles/files/36237851233.pdfIn PDF document text
    • http://e-hematologica.com/users/file/zesufoxaxunuki.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/ronuxapifosibejakipuxisim.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/58780477581.pdfIn PDF document text
    • http://isvpro.com/custom/files/koxumosipowoditima.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/livoko.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/14014421328.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/sefiruwojilozogabetiforij.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/64069411077.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/fenulonipej.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/60145589908.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/biguwem.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/zuxenosazatorexemisuxo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/46789288731.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/41033963120.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/xezokuv.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/47648448071.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f12dbcd9---18744570771.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/62698452086.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeaf9078f3---fusalif.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63716294572.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/jusiwe.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/xetofesoned.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/xafulunarebofuzofimekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hios+launcher+themesPDF 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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 17892 bytes
SHA-256: 34afea5833e5f51d2adb909168e7abf257f4b2c4feb31d09a92893608932564b
font_01_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 10588 bytes
SHA-256: 51f5cf5b74c3f1e14cad3b3caed7c9c0b316c22407b9ddb0189e1bc48ab7f836