Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1504c3e52b23550…

MALICIOUS

PDF

81.3 KB Created: 2021-10-07 01:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a5e8b67bc52b6f6a121e1c9813b361a SHA-1: 7fafab824d12e8815cb9d18718ee4c0188262398 SHA-256: a1504c3e52b23550d76e5261f3ea6e5c5b01639e512938ed2084de171b4aad6a
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. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple external links suggests an attempt to redirect the user to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/waxalanexupo.pdf In PDF document text
    • https://rhodium.vn/uploads/news_file/69086565855.pdfIn PDF document text
    • http://iviltra.lt/images/files/kebojofopi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed8526232e---1712061508.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/fovinupalakemasakepej.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/labufububelurawodenew.pdfIn PDF document text
    • http://www.toptehnik.si/images/25632846341.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/wuzilojiriviwudatekadedik.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/28692368586.pdfIn PDF document text
    • http://hzqzg.com/d/files/viniborezusejifus.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/ruzonuvopob.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/21342276936.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/68908348326.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/jiwusuniroj.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/22412511038.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/rokabipejisepukik.pdfIn PDF document text
    • http://plise.org/userfiles/file/ronijufa.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/minawafoxosuragirabepale.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/dotofow.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161340cc424aac---25580754255.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/97701368608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+summon+marbasPDF 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_off0000d405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 19580 bytes
SHA-256: cab83d37929f83cabd5896ccda81c2088ffd6954faddaeb51e7c261d96e7e311
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 10316 bytes
SHA-256: dee356e47244a6086bbc6a0644a0a9ecb040cdf819b50ac0e9d7a78cc89833b8
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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