Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f07f50d99f15b82…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 07:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 547565a043f4aaaf17b3e77902da4b5a SHA-1: f17a2e5674bc12bdd66ec61184c38806245c3632 SHA-256: 9f07f50d99f15b826d1f7069015a1252a1b0130db34b2daa2d07a23d38bd92b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload via the embedded links.

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 http://autofactory-jin.com/js/upload/files/rejasajekaresoda.pdf In PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/jimavodoxejiwa.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/80423969361.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/26342030168.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zipow.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109041648358617.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/mepobafekefa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161354e5e78455---zozubudefoxa.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kikax.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/kodigotevifuwakererujove.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/bapenizuxubebakixiderip.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/19361019545.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zotodo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/67198282867.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tibaluvoxifawunutugod.pdfIn PDF document text
    • https://fond.ru/userfiles/file/67812383477.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/gudelizavuzuxowojibalilov.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/163172523383.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/94434565100.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ffab5017ca4885df0dfb1429ee042c47/lozigirani.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/kirigasepikatoribinu.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/womewutife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+harry+potter+and+the+deathly+hallows+part+2+online+freePDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17264 bytes
SHA-256: 3ded6512b0bdc7d271953392c5ccec472305dac6d4ebe7e1d4eb53965b14e922
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 11032 bytes
SHA-256: 76ea5bd55e251dd9638a28c40a7c95d89097849861e99558ea99a12630afa3fb

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