Malicious PDF — malware analysis report

Static analysis result for SHA-256 408bfec63bd5d269…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 04:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43b5d1955f8be8ebe45d94e85d171898 SHA-1: 056c7f9384dfc21ce5cc66e7c4fdba5be13e2fc3 SHA-256: 408bfec63bd5d269f75e7f772333faba61bd1fcde4cd87550ff76b3b2c0af43c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://kimwendelldesign.com/ckfinder/userfiles/files/fonofuzeterid.pdf In PDF document text
    • https://foodthings.us/userfiles/file/sagarosutasafinirasezo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210911045324745048.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bimiruzata.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/forogisodupinajati.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/giragasarijep.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/63239140543.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/54519845487.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/wupetarudam.pdfIn PDF document text
    • http://partnercable.hu/files/36731431338.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/2613321455.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/menoj.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fewoxubub.pdfIn PDF document text
    • http://rcot.by/pics/files/68454720882.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/vupoginutimixuriva.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/96872130877.pdfIn PDF document text
    • http://gibisch.com/files/files/nofukaravolu.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/61156509663.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/sisefaxizuxuzuxuvotik.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/24999261500.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/rupewegamoxojafudijerizar.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/tuzodugixokazagexidew.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/22592471337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cell+phone+tracker+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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 10560 bytes
SHA-256: 155e70297cf698db537dce9210ccffc872884725acc4cb2bd28878e996001c6c
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 17992 bytes
SHA-256: 54d906c736e96b1ee1cd5c12f01a845767ac4ce6c747d4121c2302e6ca48fc70

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