Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f16758ef18d60df…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 13:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45e801965d2968c602b03a90da02d713 SHA-1: 449cc0d01a09e13cc250190d1e38d05977ce19be SHA-256: 9f16758ef18d60dfc80b45522d014b45c24240b7e61029926c14955d799600a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=summer%27s+day+spirited+away PDF link annotation
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/99855347719.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/jefuwazevasejizilifuzura.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/47011443300.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xewumosedid.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/72565327677.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pobuxolef.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sikudefuwarob.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/14881635912.pdfIn PDF document text
    • http://ahchala.com/img/file/xasovewurelezuxasodiwomo.pdfIn PDF document text
    • https://alpinashop.bg/files/bibeporerebidinivowuj.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/60149989795.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/42397202941.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260d0dc73d---97319583440.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/62896461032.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/sisedewunoj.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/tojozilibubetugebepuboba.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5501998105.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/rogexitules.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/568b4860e670ea14dd25a9ebf7434fa2/rosonekulomedawezaka.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/45504479929.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/96474261422.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/53857166418.pdfIn PDF document text
    • http://seritour.com/rsm/files/31019662360.pdfIn PDF document text
    • http://topflexsports.com/uploads/4593980317.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/46551835675.pdfIn PDF document text
    • 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 10692 bytes
SHA-256: 6520f4a7283ad133d17fb0289a51853939f73e3af612131015a98b69b275092a
font_02_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 17272 bytes
SHA-256: f5ca68b1c8e6aea990d355e68318c2129633a8ded11beb75d694473d86f0229a