Malicious PDF — malware analysis report

Static analysis result for SHA-256 eace868d32122ca8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 11:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41163e123cb3c9df53ca829729f13690 SHA-1: 577eb92b1be3c585e98cf40c6cf14680037f7e06 SHA-256: eace868d32122ca85a07e86b65713c83dac440a863cc212027c6eb382104abc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as a link farm, suggests an attempt to redirect users to phishing or malware hosting sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wavowojefogujiwagit.pdf In PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/15160914489.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/pavufumutelavujeza.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/42037994917.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///39856145004.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nofiji.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/vemovazemakunibebalasuj.pdfIn PDF document text
    • http://rayanchem.com/d/files/dotelamijulerobef.pdfIn PDF document text
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pizopovaxiko.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe7c6fa05---kikubulagefur.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210912021002.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/rurifixuzuwewemu.pdfIn PDF document text
    • http://ned.ru/uploads/files/vebeliwumifokavulaxe.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/zokajumunisoxunesunenokum.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210920114612.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/65832867150.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/wonufofejudoguwa.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/samupotopo.pdfIn PDF document text
    • https://cicimanis.com/contents/files/rojagedageto.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52a853f3d---melogulujil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=print+via+wifi+from+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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 10324 bytes
SHA-256: 42c3f81d4b7fd0fd34c516799548bb2681062f435d084374da0e55d5df4388cb
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 18164 bytes
SHA-256: 3cb81d7aa082978ac97cc67d897a307ab397cd462dba3e09977523a51fde8a95

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