Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cb5a92f74d68cd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cec3db05f82d315cae6521a7921188a SHA-1: 956965f7c39f79e348f538c0e2561e10885b79da SHA-256: 75cb5a92f74d68cd2eb9c79b9e6d41ea157671d5acbaeb7e80daf405a62d5dce
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. Heuristics indicate it functions as a link farm, embedding numerous URLs that likely lead to malicious content or further infection vectors. Although no scripts were explicitly extracted, the nature of the embedded links and the detection as a trojan suggest an intent to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/bagiva.pdf In PDF document text
    • https://alkathirilaw.com/userfiles/files/9012985193.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/34889210703.pdfIn PDF document text
    • http://idroter.org/userfiles/files/51965081243.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/97676856348.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/33227775443.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef1846561---26217681192.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/tefabude.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161381e3ee6eb6---dadodadedes.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/17567627573.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/xivomizivabilotog.pdfIn PDF document text
    • http://iscelenie.info/files/file/xepegotesutexudeki.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/zaripikutetofemuwi.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/73581716350.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/rukexudomuxegixu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/4386830506.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/20290451028.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/5733117208.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • http://szhlfz.net/upload/lutimewadotadogamek.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/48731907965.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duxogurefominebureki.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/90120759182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=journeys+spelling+list+grade+2+pdfPDF 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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16796 bytes
SHA-256: 60073724fcf04e9418852abc7b760f1237c7a2065d0779e1082031633f9ea1f6
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 10996 bytes
SHA-256: ca12952a5fa14c2284cd999d0de514802d0cbfe84ee90374b30558cb72e5f48a