Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8945c04386a90a6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 06:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccd2161caefa10cbf403dd4f44ac5dcf SHA-1: b1b9e702b26389eb06540e46a78f721275590637 SHA-256: f8945c04386a90a6d23aebe047275b7e9e6554a01e27342545e5839a95a47100
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms and disposable domains, suggesting a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is structured to host many links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://www.southdownscellars.co.uk/ckfinder/userfiles/files/pufosimiraxabotigego.pdf In PDF document text
    • https://baoholaodong24.com/userfiles/file/88148019514.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/11056153628.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210913_A9FE602E98B0FA08.pdfIn PDF document text
    • http://runhouchem.com/upload/files/94312172462.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/425082291.pdfIn PDF document text
    • https://tekmaker.com/upload/files/rurotizat.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/vanigoliwavorezanove.pdfIn PDF document text
    • https://mkart.it/uploads/file/76025140615.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/xokaluz.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/79529183554.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/68461818159.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/74887174259.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/346707296.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/59270222380.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bukiwuzenu.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/45874408325.pdfIn PDF document text
    • http://lagrupacio.cat/file/zikifonipa.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/nazutimenasizibekadepo.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/tanumip.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137675e79422---vebifajazivibarog.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78f04f3fd---genuxofelisisa.pdfIn PDF document text
    • http://asid.rw/userfiles/file/84987337792.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/78740648038.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/34457606764.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/tugimadopodudagilebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ip+finder+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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 20936 bytes
SHA-256: 53e6d0fe9ec4774b9899869cec84950ee380a611078f319bcd625b7c7f6a45ea
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10132 bytes
SHA-256: a40749807bd36fd36522e01ff51d345ace9f60f554e686413829bea94805ab46
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1