Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0f9149bb937e48…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 07:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1406d9742435f4c40837e1ac31137ff7 SHA-1: 44b4d33e212e7357e5f75aabc3c5206395f7b268 SHA-256: 7e0f9149bb937e4897ce896d725566793ad89cbbc0d572c0478ac0089cd2f119
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of distinct hosts and UTM parameters, suggesting an attempt to obscure the final destination or track clicks. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pphu-joanna.pl/fckpliki/file/gotefopemofaroxepukobapad.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/62564930677.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/37265334944.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/33614570579.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pexifelurevomegivugel.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/talusepuzifok.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/40207901389.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/45107416873.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/nobagulexewogatow.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/petitozadowovutedoreji.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/52128416846.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xedav.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/xujabotapaf.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/wezumufibazuwirogitinezu.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/70663345923.pdfIn PDF document text
    • http://fohow77.ru/upload/file/kawafotimuwiludamibu.pdfIn PDF document text
    • http://totoumi.jp/upload/file/49276539510.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/48625997968.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138038be1a52---zezebabog.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613566a79994b---rawapofuvugeme.pdfIn PDF document text
    • http://vpsystem.com/files/fck/87459674957.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/kobanilavekimetobovekik.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_220848.pdfIn PDF document text
    • http://elma1.ru/!upload/files/59010478967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=app+cloner+premium+download+apkPDF 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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 17640 bytes
SHA-256: b266d1e1630a13e61b877f9994a8fad0150b8709524d9ed65dd24e631384bb71
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 10668 bytes
SHA-256: 332f9dc782bd23b8ca9f8e89966ba8e0021b54f7a32d2c0feeed1d83065ef7dd