Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c3276773744ab2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-20 08:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0951e5b30cd2312eb056237b8f11c8fd SHA-1: c53c4eca65d1aabd4bcb33619c4e26f11711c7de SHA-256: b8c3276773744ab2cba924546a82b4acab63e89564c8ebd3c38600c21bfdf274
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://progettocecinacuore.it/writable/public/userfiles/file/kavazazimile.pdf In PDF document text
    • http://mitroc.com/userfiles/file/jisugitosejos.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kubigakatanaru.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/garasagusim.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/21597628565.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4qftpft53v8qss8eg0rldcq5c7/wevijenudogexitiwape.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/wifevimovagotimilekaze.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/76915994527.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/87598403577.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/33265324457.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/vunopedunefegosawadu.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/wosepivigexoninatigebego.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/12621027038.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/92994709975.pdfIn PDF document text
    • http://gysanya.com/upload/file/210907041458611373zisp24iu7oc7.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/99610162481.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/68896824497.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/cplma0m2tt5ll3f6hc0mq0q13e/muwuxazatiku.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/sogidewovedi.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/4551696326.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/4773582335.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/fiboxilukawupuletudisole.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/wejulomulazijilubupe.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/58640663508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+wavelength+of+visible+light+is+in+the+rangePDF 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_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 19052 bytes
SHA-256: 9c73ff616bc8cb7e6055d22c04cded5ae253843956cd431b9a51c044c89debe6
font_01_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 10748 bytes
SHA-256: 8254f06d3d933d159e30dc325c085753644f248ee7d1a8023e4f105a27a61020
font_02_sfnt_off00013d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1