Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b367644eee45cc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 08:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0726e095f145f294061c67f42e666429 SHA-1: 63c12cabf745980a9cba54a94cf7c71693699e54 SHA-256: d6b367644eee45cc8cf65ab9a8e03ef58274dd5cc00b0ac317e53b1008a8355d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, directing users to numerous distinct hosts, likely for phishing or malware distribution. While no scripts were extracted, the presence of many embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=wifi+fingerprinting+android PDF link annotation
    • http://twapp.freshkon.com/upload/files/9867493384.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/zebowejurasibanuxa.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/dejesaxemumepolawasaxo.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/giwesasafib.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/lunopidalipos.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/belotugitelulevapifuparo.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/rufezozetijepaweduxeze.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5e1b51cc---50729324488.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/28675852374.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/nanolu.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/funodemadolalamuro.pdfIn PDF document text
    • http://tayles.com/uploaded/zufutetegedisupi.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/voxivu.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/68375714702.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/9307383927.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/50509174966.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/neposidivabumib.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/jebadazodikubinopuzot.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109221105307213.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///59120420855.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94581290927.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631089109.pdfIn PDF document text
    • 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_off0000b9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D6 16100 bytes
SHA-256: fc5056c2f938635921eaba21b2223495a30c5e5b67c818e845b5ab84dc302d0d
font_01_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10452 bytes
SHA-256: d759303515083ffb3b5f01b6c38b32d3e606de03abe15fecb4aa954ba4298969
font_02_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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