Malicious PDF — malware analysis report

Static analysis result for SHA-256 558c62c1693ad4fb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74687b56c16e93d54d02ea79255329bc SHA-1: 8c1f168e9232a0b76f842557f29bffce2168feec SHA-256: 558c62c1693ad4fbdb2b6c85430a613e523c0d21bd8fbb033257f4489abfb087
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document body, though heavily obfuscated, suggests a link farm strategy, with numerous embedded URLs pointing to potentially malicious files. The presence of multiple distinct domains hosting PDF files reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://parentini.it/userfiles/files/18937202535.pdf In PDF document text
    • http://monticellotownship.org/userfiles/file/jijafulaboge.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/suviratewiruvofuviz.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210908203741.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/tozibujilokedozu.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/vowasenaroluje.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/rimusiwimanudura.pdfIn PDF document text
    • http://leskovec.eu/files/file/46309360117.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/69563713929.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/58013148887.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/benam.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vavonev.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614232a59eed9---bivifedeviwonumebomab.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/gizelidukimokugipewibo.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901105937.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sikusoxeramiderun.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/94997860726.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/38441032235.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/movubuf.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zadizat.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/bimisalatid.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/99470872113.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f86441c2---37968274666.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/63925101543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+1.16+free+download+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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 10668 bytes
SHA-256: bee95a382b614009ab924d60c4063e9a8f948ecf6d453efe3342364815d2df00
font_01_sfnt_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 15864 bytes
SHA-256: fd6938b9b7487985f03fc7f68f3b999dce6b1634a7bfb2551aa45d16b883c9a0
font_02_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1