Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb54c8f7fe88a5fe…

MALICIOUS

PDF

97.2 KB Created: 2021-09-14 01:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf9fd98a7b96c5750dea2b242775c206 SHA-1: bf476886afcf801fbed4ea779852af0db8dd45bc SHA-256: cb54c8f7fe88a5fef5fd9a15eb60b734706ea0c4a564701cf6e61902df230518
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to obfuscate the true destination. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The document likely serves as a lure to download further malicious content, potentially exploiting the user's trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=flash+rom+android+tv+box
    • https://doitoutdoorz.com/file/LWbbpwat3OlznBhA.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/gukobevojalirojeverak.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/paruzis.pdf
    • http://frutapac.es/ckfinder/userfiles/files/2516181624.pdf
    • http://dspec-car.com/js/upload/files/gerosejikumomi.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882cc26869---botinamadenuxadopikimo.pdf
    • http://parfumland.sk/upl/jenuxodezenofonuvi.pdf
    • http://upakuika.com/img/file/30114211821.pdf
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bajoguwoguto.pdf
    • https://curtain.jinware.com/upload/files/wolokufup.pdf
    • http://jamesandsons.ca/userfiles/file/zelugid.pdf
    • http://headrepublic.pl/images/files/keniruzupadexodukosof.pdf
    • https://valgott.com/images/userfiles/file/futetesud.pdf
    • http://abwwilson.com/uploads/files/midese.pdf
    • http://ekorepetycje.eu/Upload/file/91389998764.pdf
    • http://tries.cz/media/images/upload/file/lekiwumavoxuz.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/tugedafovapogovutodarupi.pdf
    • https://bliznacite.dvsportbg.com/files/57837428226.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/47446781892.pdf
    • https://principesgs.com/userfiles/file/pigutozojipakalagag.pdf
    • http://www.larche-de-jules.fr/ckfinder/userfiles/files/90440958253.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161338412e99a4---gonopabe.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/91977754151.pdf
    • https://bimstudioinc.com/media/files/nozujun.pdf
    • http://bellamy.tw/uploads/files/202109110103442387.pdf
    • http://dekogard.net/deko/veri/_files/junibuwarutijufazujimobin.pdf
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/7980777392.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011562.bin
2875859035b523410a6ccfb35134541d08757e6e58634aae0cd2aac963692b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 18676 bytes
font_01_sfnt_off0001467e.bin
af82facebcafa9657512fe4eb9d770eb07a6e545ee088a8f20ea874e7bf1e0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 10664 bytes
font_02_sfnt_off00015eb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 16792 bytes

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