Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f2d53d4762fe96…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 01:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a7a7ce326cd54ea10e10d778c2956bd SHA-1: 247948110e51e4b7298041c485f29c8b93b1c752 SHA-256: c2f2d53d4762fe9684282a19d04d7c77c26a8940b380696da25b162fc88b44c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for the external URI redirection observed, which points to potentially malicious or phishing-related domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=call+of+cthulhu+rpg+pdf+download PDF link annotation
    • http://csc-vietnam.vn/uploads/userfiles/file/rerav.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/97941196016.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lerudisuvuwe.pdfIn PDF document text
    • http://progetec.org/userfiles/files/valolamegenejevuguwe.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/97514761311.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/lenirigilofazizak.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/75753171659.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/175730445861326099a25a5.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ace2b94ded91afd3612163e3cfe877cd/zujowopojefuwivil.pdfIn PDF document text
    • https://mollis.rs/files/60245237495.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/6597150695.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/17444730830.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kuwokekasejulamurosevu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/87061340497.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eadbf1219b---80953964993.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/78019107082.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/57376889861.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13146572365.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/6618398912.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nofalara.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/wevudefonixafag.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/25991748937.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mekavimelosigujak.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/18374888821.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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 18568 bytes
SHA-256: f9a8f88500cf68842171d11fb3ef90d87fee61fb2577966b7b41ec7e96f588f1
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 10724 bytes
SHA-256: f661b4f2869693ee627295ea30dbb7088ad44d8b0717c569bb903c9313d99bac