Malicious PDF — malware analysis report

Static analysis result for SHA-256 136e60a0f3a99ee2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 08:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69c382129c2d1c6e2c6533ac4762e695 SHA-1: d000c08573c66e23036313ffea6d78e399cac08a SHA-256: 136e60a0f3a99ee275d4394037e96a848575fc4e075069379ec2e3f646cc4fd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a link with 'utm_term=coloros+11+download+apk' suggest a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://hasekei.jp/userfiles/file/10698894333.pdf In PDF document text
    • http://www.beverburcht.nl/upload/files/viduguzuzafife.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/823497647.pdfIn PDF document text
    • http://zuche0551.com/upload/file/sisetilulisememikolejav.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24640827283.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/52091967300.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/18990530790.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/kifiw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6f19f95ag23gsjr29u5308ahcf/lifafikezevaropavupijuwo.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/kixikonobujewugabas.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/72842747702.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/nopil.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/62572307939.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/94673293572.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/37139969214.pdfIn PDF document text
    • http://dentistturkey.com/image/files/55990904935.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/notum.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/77561870235.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/bemoredobobukaloxibebow.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/2889092274.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210917_1D3B60AB30F8B96F.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/xuxofabazatusizofupamesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=coloros+11+download+apkPDF 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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 18080 bytes
SHA-256: 994748a263238ad757f37378abad373db6995736912152066885b152b193846f
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 10324 bytes
SHA-256: cf7e9e8d088322d7e5fe8ef62e7a49f01e10e4aac2997e84348c2304d317d5f4

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