Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2f1ed9a35fac3c…

MALICIOUS

PDF

80.6 KB Created: 2021-10-08 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3812732c7036bf676d8f7042aaa5c1e SHA-1: 2c8d05a198f38a24e80c2e403c82b0366ee1e739 SHA-256: 4f2f1ed9a35fac3c603b0aadbdb60e5c1a308c66336c4a9ca003204ca675e5ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or link farms, indicating a phishing or redirection attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hooleihomes.com/cms_images/file/53937905133.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2d110aec---kuzotumepi.pdfIn PDF document text
    • http://belloverde.net/emailer/file/93320304892.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/lonopogubigemotugakemul.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/60720126612.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///35645776442.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/82252768651.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/xofiziwo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/5353041944.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/gitazekokev.pdfIn PDF document text
    • https://senfina.top/uploads/files/zejetivenudivorativ.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/45802690521.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///mudasekekifomaxatiki.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wipuvale.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vosijoxedakitinelog.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/15620396904.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/476e212c3f0caa862f5538a9040fde37/33860014224.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/9834258795.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/peripixisezadinififi.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/nuwalokatiximunedan.pdfIn PDF document text
    • https://anfauglir.com/images/file/minebesusebewedu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/87954646963.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/10665979620.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/dazijisekuxetetejiputexu.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/87014521590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=slicked+up+pupPDF 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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 17736 bytes
SHA-256: 7cb11cda107f4e97b856a2dd08ac753daf0febe74654788af2ba166cf1c40769
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10020 bytes
SHA-256: 241f1000e3e2aab6ae7a00bf9adb2852a0cbf50547fd44e0c73a945314af0473