Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd8c1aa55a8392e…

MALICIOUS

PDF

70.5 KB Created: 2021-10-06 12:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e224314fa3ae3f283de4e95ac141df3 SHA-1: 75c6231f23386e6e906f9f6fa63c7803b0ad8288 SHA-256: 4fd8c1aa55a8392ebddf21712c2edbf3895c75f286b16bbd30c07cae16955027
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URLs points towards a likely initial access vector via spearphishing attachment, leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://synerhu.ru/uplcv?utm_term=free+brand+guidelines+template+pdf PDF link annotation
    • http://ferien-in-zahren.de/images/file/gixewoje.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/viwotovulopogozadelo.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/dorum.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/sefodijadeniko.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/xizitavefi.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/91554821500.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/vapanot.pdfIn PDF document text
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/nefedas.pdfIn PDF document text
    • http://masonhn.com/d/files/79801064439.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/54992957435.pdfIn PDF document text
    • https://www.bandungpilotacademy.com/file/33322570616.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/dovagutuguz.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/bodeduxuz.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/59486260637.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/16767463745.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/90685021002.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55020940133.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/fopigetebisidireguji.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43417202328.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/27848405064.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/fenijivad.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/23001808623.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/dinixadinotawo.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_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 10940 bytes
SHA-256: f10783534f25424a6bf7f72f1be6a02e3da70c296842f5d1c64ee584ae9c6ebd
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 15696 bytes
SHA-256: f9bef14e4ba32d2f8fba00e57bd9bd84801b03cd629c7046c2a933d926dac223

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