Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff144614d467b44e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 17:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c30cb77b162fb020c600f9c705da60a SHA-1: 3a37355dd3de940c3438963a0a51693bc6865d7e SHA-256: ff144614d467b44e2cf57989c9b7ef4bc67559f7d12a6449e7bc03b7b63d14d2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many hosted on disposable domains, indicating a likely phishing or link-farming campaign. The presence of numerous external URIs and the link farm heuristic strongly suggest an attempt to lure users to malicious websites.

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://queure.ru/uplcv?utm_term=extreme+car+driving+simulator+mod+apk+all+cars+unlocked PDF link annotation
    • https://bangprice.com/bangprice.com/beta/cms_image/file/gexenarolebokuderun.pdfIn PDF document text
    • https://pokereshop.cz/data/file/tofoneb.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/76747607100.pdfIn PDF document text
    • https://cargobull.cz/res/file/97714965606.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/11558032550.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/80855649798.pdfIn PDF document text
    • http://floresdeserrezuela.com/aym_image/files/xokokifutujagojuviw.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/doxukaxubuja.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/66477086334.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/24640827283.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/32300114600.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/kogemanagegogol.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/nomubikorem.pdfIn PDF document text
    • http://perksys.com/userfiles/file/85420513025.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/89868057752.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/wupexekabekejomujaje.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132192ac31ac---tilalosafezurebobilonarof.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/85523987931.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/riditosadomubazamemeziki.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/040609311540.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/57937989541.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/barigegor.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/koromi.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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 11200 bytes
SHA-256: ecb5df82016d704fbb4aba6f876f96a9fec11c880c758fdbb1567213592032db
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16080 bytes
SHA-256: 8e318c6217e49e79217dac6c6fa8611efb4dfe8dba67ce0b5e1c254cd08ead0f
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1