Malicious PDF — malware analysis report

Static analysis result for SHA-256 764141c73d2bdd0a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 09:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3becf2b1e56c1cb4e45c143b4ee848a2 SHA-1: 857c720df6dcd889779babdc44c9b11d01dfe31e SHA-256: 764141c73d2bdd0ac71bf43f6b20723d27c9f750f76a20baa3928aedb74529ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 phishing or a scam, by directing users to potentially harmful external sites. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://unseretochter.ch/images/file/meposekuxegemuxif.pdf In PDF document text
    • http://fpempresa.cen.es/userfiles/files/kupuranewadefejilux.pdfIn PDF document text
    • http://dothi.info/images/files/bemoweverekusebo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/29628a84c20d7b2d1b31147fe59e1c65/15120162279.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/70317725809.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sijume.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/86306867161.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/buxodezewav.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vukowapusotimagugib.pdfIn PDF document text
    • http://ilkemymm.com/image/files/riligozagimojejumog.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gexukoz.pdfIn PDF document text
    • http://metabolit.ru/files/file/57087475700.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/nibefaxadekatadabixes.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/fowomavirovalinalina.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/79244959646.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/getawizagesorot.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6uisp5081h72emm2km30rllh08/xenileduveru.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/punufikoparitijelapokef.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/35207935598.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/nenufokonevekafum.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lukise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dark+mode+launcherPDF 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_off0000af6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 10468 bytes
SHA-256: 04cc8ffe34ca55225451bd40615af137551ae7f2f2cf260c83272ae3fcee7be5
font_01_sfnt_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 15332 bytes
SHA-256: eb719d3e43ec2e5277b0fa0b71890123604d7e02b2627adef937521c8c10e10f
font_02_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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