Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c23a18c571b1111…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 10:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1abc70b1f7a2ae927bca98f986278463 SHA-1: 6caad573216595a0ecc49e8499f1d82fdd0c9f1d SHA-256: 8c23a18c571b1111ee595bdcc1f8e303cb18cae6d6a54ba156d5036453de3c84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or leading users to malicious sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://traiteur-ribot.fr/userfiles/file/bimutegedulexup.pdf In PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41388557548.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/jufola.pdfIn PDF document text
    • https://lecachet.fr/docs/files/suletobigokokuvakimaz.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/24212055569.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/32162237857.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/31922998857.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/88236883003.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/lixifurowoteba.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/genosuk.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/suxaserojupaxizebodixipur.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/65679322552.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/3774079229.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/8679407133.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/75571724006.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/vomuwinawebagevewixu.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/lawilodotojosevul.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/26647944175.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/29490053231.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/finapidamilazinebuw.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/kakiwibapekebazirevojegub.pdfIn PDF document text
    • http://xsteelstock.com/d/files/rogadunu.pdfIn PDF document text
    • https://brukspec.pl/upload/file/73542451181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=formula+to+find+the+sum+of+arithmetic+seriesPDF link annotation
    • 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_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 10820 bytes
SHA-256: 7c5186b82f05a40fe14b0b107fd11e5deeb5445284e8d71f71a32d4952076cf2
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 18424 bytes
SHA-256: 3e65b76c2f82881ae3456c95ccad122b07ece8369b3a9464308e5f1dea2a02bc

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