Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63cf5c15bf3cc23…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 17:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 659c49c0710df414b887b9dea82e90e3 SHA-1: ad2275433f354a9b4e70d35f380a45918e02312b SHA-256: a63cf5c15bf3cc235a1e26a078625083466307dd68ccd035d4d2e040e28de211
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and a link farm heuristic indicates a pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://asbu.net/uploads/FCK_files/file/bafugobivuzitojowid.pdf In PDF document text
    • http://leguido.net/files/73179782557.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/79492070389.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/72098951218.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/75649288568.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/iec7p4o3jo10ocr0vte3sndvc7/xefozux.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/vijirekikipixiligorig.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/59807110985.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/tezidijokapavaw.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/63086347552.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e28e74b3d---66266823428.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/nanelesopalubudu.pdfIn PDF document text
    • http://bankerz.in/qpic/files/tunikusejosidexex.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fabaxigokawipo.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/dazigir.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/64659640869.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/vebomuvividotujalizumami.pdfIn PDF document text
    • http://chikatere.com/Upload/files/7924702110.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/64611523095.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/kugenazala.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/besipa.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/niban.pdfIn PDF document text
    • https://armenia4d.com/contents/files/loruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bhagavad+gita+pdf+in+malayalamPDF 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_off0000c288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 20360 bytes
SHA-256: 9f8300d41bf616f5922d23bb42a10a4112054c32f66578da0f891909aa5a9bdb
font_01_sfnt_off0000f737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF737 10660 bytes
SHA-256: a93a71b8e04ea04fd2e54bb84676408157c587ec779fc213c58e2231dc9a4751
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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