Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e609844417964a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 01:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94dc1a3329bc471e93d2d667693fb089 SHA-1: 71154c5f07623bbe9f2877a4b07b3a227e2061a7 SHA-256: 98e609844417964a7ea6470dc560852600bf0872b1caf4f81132d9f1563f9b75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9f72c00e---34060548414.pdf In PDF document text
    • http://mojaksiegowa.net/userfiles/file/75138603709.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/98111032206.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tidogujerijosagezasowazef.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/49313064653.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/14369368129.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e26fd2a3d94d89005a9d996334a23ba6/sugekumutafuwuwevafujober.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/51399303538.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/padogogun.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/78927773870.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/degimetiwakoxem.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/darin.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/20908305178.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/gazifupowix.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/xikewosenalupalotasunax.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/88487208352.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/xison.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/43357043548.pdfIn PDF document text
    • http://bscartridge.com/pic/zopitejajivipi.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wolixiraxe.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pisubevotivam.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/rexenafafiwakewojebuvonav.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/10965900886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=why+is+all+my+apps+crashingPDF 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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 17660 bytes
SHA-256: 5a2323ad718990923c1b9a8d42fe63f0be44ca9d6c6dbf6c55471edd26da42dc
font_01_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 10576 bytes
SHA-256: dd1c15a956fa36ee39909eafe591440988dc7333dff4aa2da26c973b81d2ce36

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