Malicious PDF — malware analysis report

Static analysis result for SHA-256 190ceef9772f6a73…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 02:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b2b14ec9bd58525f6e42fd8b0bc5baff SHA-1: c783aebec950f70512a4ff46a90bbfa249f53889 SHA-256: 190ceef9772f6a739fed2db52d2f2b4a1b06ffd0588b4533ab46cab654ec0eaf
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=low+cost+smartphone+in+bangladesh PDF link annotation
    • https://binarbaidservices.com/public_html/userfiles/file/nefutakavexeniwer.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/fizidibidimab.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c8704b7a71c73e35d5efbb87d7112d72/nixulesusevelosanijek.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/16917208809.pdfIn PDF document text
    • https://everestart.com/images/stories/file/fepabugonadis.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/44803036585.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/38079428751.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/70753224921.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/8037561316.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/jeputalemufabikepopapuvin.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/17893918405.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/29863036084.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/15553951415.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vefiwivarogurizaxinun.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109010417589790.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/petotafisab.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rarulexizuveruravowego.pdfIn PDF document text
    • http://nature-revive.org/files/file/kubifix.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161399ad933a24---71505671917.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ffc58b1db---zirunodut.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/82545955846.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/25113294444.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/vazidilegolapul.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/sotetibojerimuxolezeb.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/folepufatapegalefipu.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_off0000cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF2 11144 bytes
SHA-256: d5160d672840fd54fc0e740cee3195ae98072feb852fcc1a1fe461d65a72b152
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 17552 bytes
SHA-256: f2871af573268a04c8ae29b58ea92395264f0a8221eb97f20d67406f01becbf3
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1