Malicious PDF — malware analysis report

Static analysis result for SHA-256 27261304f8719c80…

MALICIOUS

PDF

90.3 KB Created: 2021-09-08 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bda4be18b715f5e80652ff3a229b9f5 SHA-1: 7e6aad8263b2b5bae82cdb51d417b99e61093b05 SHA-256: 27261304f8719c801c5d27e7317d31fc1a49d002dfb9c7714c0d90212352f332
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, suggesting it is used for phishing or to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=koralina+knjiga+pdf
    • http://csc0516.com/userfiles/file/20210903045954_gsg7r1.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaea92381d---65308972622.pdf
    • http://tns-china.cn/editor_upload_image/file/3339921225.pdf
    • http://vallovin.it/userfiles/files/bosegasivomopa.pdf
    • https://onutglen.com/caningest/images/file/46554679772.pdf
    • http://laxycoffee.com/upload/files/82216726957.pdf
    • https://groupunsur3.com/contents/files/bubobemununuwubofikamuse.pdf
    • http://infas.cz/images/wiswig/file/jelesutefesanufojevukel.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/4981478120.pdf
    • http://cottoneauto.it/userfiles/files/74400940833.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/nejeritebupefajamerawu.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/33421908820.pdf
    • http://vonschickenfremont.com/uploads/files/34318713063.pdf
    • http://totoquynhhuong.com/upload/files/gupodenemet.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/dajabofomusok.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/sidesajuxiduke.pdf
    • http://alvit-bk.ru/userfiles/file/19831604892.pdf
    • https://elegune.net/files/galeria/files/kiborilukevinudinugeroze.pdf
    • http://www.miyadenthai.com/image/upload/File/dureramukibutowu.pdf
    • http://yourmoneyyourbank.com/uploads/File/tubizumezaxuposexuji.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132faeef15c5---lidutufevapejiroj.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/24023422841.pdf
    • http://travelshops.pl/userfiles/file/26152049835.pdf
    • https://electroagro.es/pub/files/58737459673.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 16792 bytes
font_01_sfnt_off00011000.bin
87aad27954b912c6552979a9b47059ff11a7cc0343344374dbd850141fc45456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 10488 bytes
font_02_sfnt_off00012795.bin
6a76382a2f82c9275f0c4aeb436eed751c0f9905ef0e525e4ff4814bb084312f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 20316 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.