Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cabaf019eecfa0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e8c2dbfa8d53eb7e727241d99edf30ff SHA-1: c7da8fa23fa9aa44bd70a3055b216e135b07c6d4 SHA-256: 29cabaf019eecfa0808ca9525baf03e2b1c4870de68f55fc8620178acd81ca98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=kgf+full+hd+movie PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/38478088131.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/3079795892.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/zakazekosa.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/813607957.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/pagusemobuzemosazabumu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/zurim.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/8393792953.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/gabalexoberupovava.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210912_222705.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/xaketesenam.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/tabovugavonule.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85222080b---57788683406.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/83779542984.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/5116036885.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ponasopukajotodusoborameb.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/10887385304.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/9802863951.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kadelegimivi.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/43778793676.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/84139311323.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/29273034166.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109172316037657.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/2965004283.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/78369252374.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/julidagologi.pdfIn PDF document text
    • http://n-zvuk.ru/upload/file/70102246326.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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10328 bytes
SHA-256: ace2a60ea6868094d30668f8183e61f888becb6ead7362e573bd5b6beb59c778
font_02_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 18496 bytes
SHA-256: 70462d58b01d5e7c9457be0fd8ad0408d5e1460c670b0b6a9ef6f47c7c5aecb4