Malicious PDF — malware analysis report

Static analysis result for SHA-256 55464ea77647c77d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51ab63c83becac9d899e188b99e24f15 SHA-1: f2afc15e8aea9c0a0dca880702356318046aad12 SHA-256: 55464ea77647c77d79c8c1ddfc4c35ba46fc3f89b1e01faae89c6e2a57b0807b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it acts as a lure for phishing or to download further malicious content. The PDF structure and embedded content are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://groupekheidri.com/ckfinder/userfiles/files/45495384652.pdf In PDF document text
    • https://korovin.org/site/img_ufiles/kudofilufu.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/dikoxolikuworebetemab.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/10886108093.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/novaboladepalizuvojek.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wedegasusiburusu.pdfIn PDF document text
    • https://kimcert.org/E/file/balifegilufikazube.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/23105737587.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/tugotetixijakotupuja.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/27311222268.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/ruwexewomejatutevefutuv.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/vepezosofud.pdfIn PDF document text
    • https://alpinashop.bg/files/nujatotujimubama.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nefepatovujo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/43334246058.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdfIn PDF document text
    • https://ottopianos.nl/files/60858703620.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/liwidavadodigoropixuve.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/kupatam.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/pekufufegimusafusejurup.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/tuxejalafemeponu.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/35822241422.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/89401317681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+am+i+getting+unwanted+ads+on+my+phonePDF 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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 18008 bytes
SHA-256: 99e67d2342fb7308bbea6425d9d8cc4ae5dc59ad5b115a4af2aff6c9304cb4a8
font_01_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 10988 bytes
SHA-256: 9de23b30c84d854d644b075b3a0b7401055a720751b7a45706299f2c3213323c

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