Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4cc029577d8778…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 13:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0580697d67eda568e595c0588a047ce5 SHA-1: 998fb88d14b2c92528fa400a8efb146aa7498860 SHA-256: ff4cc029577d8778fb21dbb4f88add8cb501b69b80803577d894237ae4a09859
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. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to a network of sites, likely for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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 http://georgewongdesign.com/gwd/upload/files/jebijopasabagebowidejovo.pdf In PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xetakoganowafejufi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/9666288260.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/jazufolituzudaruwizabar.pdfIn PDF document text
    • http://fluorescent-training.com/file/simibiw.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/91804781381.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/nivogakasoma.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/jidopagusapubivokapa.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/jenajesewifa.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/susadinixebelovexafidida.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/45892772926.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/78646855510.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/jibojijofedepukisarij.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137666f6cb39---xeludedusubozelov.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630588442.pdfIn PDF document text
    • https://signika.pl/Upload/file/48431648643.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/85565348657.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/75673314397.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/dowawifaleduzubutu.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/30847162093.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tamogov.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/45265508185.pdfIn PDF document text
    • http://edituj.cz/res/file/95228168033.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-14/20210914103737749664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wonder+book+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tegaxepobuzasiw.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_off0000b9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 10152 bytes
SHA-256: 20d76df8d9f303d3ee26d19dc8842e8e8bfb40bde4696014c8e6f6db8e1997fe
font_02_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 14944 bytes
SHA-256: 92cc331da35ff4d0836df666122481e8b98f198de8697803b2d579c2c224b394