Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a8143b3dc730c2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 17:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1c14147956456d1d742a14b93bee0c0d SHA-1: 1826a10abf41caa3ec92e12cac9d5327d5dd025f SHA-256: 58a8143b3dc730c28191df6aa73d3ffe9bf0a2e0e79fd1b7b9c6268c47a78ca2
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 or trojan. It contains a large number of embedded links, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to distribute content across many low-reputation hosts. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

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 http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/20594348123.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ledm1mh24ni5sr34b8bho8nq57/wigejo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nededefajexel.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/77620563579.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gusuxabelumolurik.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/94524461972.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/65957235849.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/13304023005.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/64191521348.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/85291923390.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/99588369110.pdfIn PDF document text
    • https://sadex.pl/fck/file/96303716301.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/penavijonodubozotimezu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/webomavuxomalomewemazig.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329034d1a05---98051118667.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/74426440137.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///ragezuv.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/42762945946.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/seziwozemadidisibupaxapas.pdfIn PDF document text
    • http://intertravel.hu/_user/file/81506881231.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/95772940389.pdfIn PDF document text
    • https://mattress-leader.com/media/17563835540.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/73774155851.pdfIn PDF document text
    • http://viorina-deko.com/images/file/potunonurokopewajisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=yalla+ludo+mod+apk+unlimited+moneyPDF 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 18880 bytes
SHA-256: d66a69f0d48dcdeb01521658b3757cad343d76ae402162183b58d663eb4a1f73
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 10576 bytes
SHA-256: 8407c26147e4e6d1ed527b0bdc58bdfe29218268600aa972ad340f0bd001b33d