Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b9c369ed75ac3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 03:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a759aeac38950d8185bbd3bd7cd41f1 SHA-1: 9612ac88d538dfa1f1620bcdd4935020927aee0e SHA-256: 6d6b9c369ed75ac31f1a44dd9b28bdb99696f9f940478a6ffcdfee70411f5362
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also includes numerous external links, many of which point to potentially malicious PDF files, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kinhdoanhvaphapluat.com/img-dn/files/badobexoleniganoraramikow.pdf In PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/ranitafanepusosodip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6527afc4---42162197458.pdfIn PDF document text
    • https://papiratisk.cz/soubory/47736354590.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/63934322001.pdfIn PDF document text
    • http://12shio5.com/contents/files/98229566635.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/dodatu.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/30716213175.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fixikopelexojagikari.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/78971180036.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614479a952c37---22764610568.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/47847044801.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fenibimo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zipomusiwaligu.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/sikaxanoro.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/rokobinelemep.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/18198074557.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/lawilederuvepeber.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/biwapakigikufikemota.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/85890575853.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/29275569762.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fasomenotabotusemopa.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/selariwedotajusesas.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/21337492488.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/11443264055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+device+manager+unlock+my+phonePDF 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 11048 bytes
SHA-256: 80276e0d1ca1f000517608809726629f90ca5e45f57bf8f7ecfb3215c6315494
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 18364 bytes
SHA-256: c895a4491adf4d927f69017fd8722b8218ff0cbb2e2d90708434ad80d7a0fe5e
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1