Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61ea3985c42e982…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 17:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55ebf00ea8c4b50149e04524f509aa11 SHA-1: 939e53713d458da3ff77975a0bc496b1d2625781 SHA-256: f61ea3985c42e9824f2ae1444dd2e0a937e15151a08d6710db61f804c98ced22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings point to the document acting as a link farm, with numerous embedded URLs designed to redirect users. The presence of `utm_term=storeplay+apk+download` in one URL suggests a lure related to app downloads, potentially leading to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/povutujanujukitugesawi.pdf In PDF document text
    • https://hahapediatric.com/uploads/files/202109040416043563.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8c73dadb179f03b173e63dc42a7c4743/tadefeguvepazogedafogefok.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/63980898262.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/roxutupugag.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/bixedakovumiwupetasisu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/gevuduxokililobo.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/judoxuxurowanawumu.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/woroxidekesogagunigarib.pdfIn PDF document text
    • http://arucax.am/user_images/file/83328206667.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/53820891226.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140494fc9310---7553942743.pdfIn PDF document text
    • http://honghuibio.com/d/files/48371418308.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/07/file/20210907_052351_200.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304587702100.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/18785898055.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/44442110444.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/60674086713.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210911233501560.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/mobomukagaxeraj.pdfIn PDF document text
    • http://air-ned.com/uploads/files/novuv.pdfIn PDF document text
    • http://nfc.soo.jp/file/33309448471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=storeplay+apk+downloadPDF 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_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 10492 bytes
SHA-256: 29c92d3d9c77fecb5ce0d8af99ffc3093dd58663ae1c3d04afd7c4db493441e5
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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