Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af875da29312d4c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 13:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc7c93ea0b74fa08133fba7bceff992d SHA-1: 8c6928e481c6061ff11b580cc665b0ee438e9203 SHA-256: 6af875da29312d4ccd56acd25e62bd89177e744f7dc7e947a740b49415e30330
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=one+piece+best+wallpaper+for+android PDF link annotation
    • http://iraneto.com/basefile/iranetocom/files/44210148029.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210915_225124.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/60084251839.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/tixokekawili.pdfIn PDF document text
    • https://cakkue.com/contents/files/21232295480.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/25770527636.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/rodiv.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/76376625985.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/zidape.pdfIn PDF document text
    • http://recrute.fr/files/files/besolumivuzoxuvogenu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f5b1a67e3ca9d776d08d31fe4384526f/jebugamekurugekikagir.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/77276268811.pdfIn PDF document text
    • http://net-marketing.hu/images/files/95883963936.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/28181200579.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/96605616494.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/jikakasizovijalujet.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/vovew.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/25989252161.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/40351296762.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/8370829602.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/dejexixewuritefoduvawidis.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/gunilel.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/foxufenoluwawu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kejebexanukirib.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f9d9dac9---3353908135.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 17324 bytes
SHA-256: 2a224086abad868bacfab4e7bb01f1c0bd308f12adc2c5434cef1ea9dfe4181d
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10864 bytes
SHA-256: 049df54d0689855ca03eef6165d4919a0be01e4c84e50034d9f3a400faf8cdcc
font_02_sfnt_off00012215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1