Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb809702f806c1f9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 13:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c2ddde8a0fa6602d568ef5288a09e06 SHA-1: 91cdc69879e00497c00ce1e825810db9822b7b08 SHA-256: bb809702f806c1f922955131c0500d30db3c20f8c04c5aa938dbe606a9e513fe
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 numerous embedded URLs, many pointing to suspicious domains, suggesting it's designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://mgs-on-track.com/uploads/misc/files/17699482245.pdf In PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/fuzedutivejenelo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313d1c5d9f5---62385015454.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/65850330143.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/62251798126.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/22306578388.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwegusu.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/29465543834.pdfIn PDF document text
    • http://tai-group.com/upload/files/1828000422.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210917051712_v9nzdn.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/71115955236.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/10499564515.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/zoxigefojezumipojib.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/rofosevoxin.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/maturelutajozonolerak.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16134072668.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/tebizut.pdfIn PDF document text
    • https://eetravel.net/file/laduxefunavoxikedokuwi.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/zivodosodug.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/36117346139.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/sesuwipaxelitudimo.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/90879217441.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/kujixo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/136e22151865a6e02501d3ea1b43973a/jagur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+oath+of+love+ep+1PDF 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_off0000cae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE9 20084 bytes
SHA-256: 7592ac285e5ea118a110edcb8c8eba4bac1bbe883dadceb74f8c8fd1e4ed779a
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10072 bytes
SHA-256: 3bebef005b2e232d22237fc963b242d544143f8669a23d8007b62c49fbed531d
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1