Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd40d8f60f4354b3…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 23:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 240e66dab4386912fc0f62ed275447e1 SHA-1: 118f88643a4d2bd153c276ee34a928474db54f43 SHA-256: cd40d8f60f4354b3eb7d09374a88c949ff91434990d98b842e642b22b0f69d09
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to one of the listed external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ofitecnic.es/files.ofitecnic/fck_up/file/77770127017.pdf In PDF document text
    • http://darstin.com/userfiles/files/82815502514.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/32306912682.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bidizalivitejanigonamuji.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e421e44e2cda26db28a8e39573751c8f/5309964902.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/aa38a21076716bbba98ccf7849c3302d/96917621714.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wudenudun.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908171735.pdfIn PDF document text
    • http://ranchobg.com/img/file/25400597901.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/36197614776.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/zozuvugolutejoji.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/75720000245.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/zonusekivukixifokukonufaz.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/1449476767.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/36371560137.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/37664285121.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/59753380446.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/gilarejaruvaxelaben.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70101733891.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33811655423.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wovurore.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/teliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=inazuma+eleven+dash+apkPDF 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_off0000c7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FD 10516 bytes
SHA-256: 44929976ad08fed87af898de1850e0eaaba6186e9c0632c5375c2e27d0f95dd0
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 18220 bytes
SHA-256: 942ef72f43ca57d7a5596ba7d44c3a045219f4b7ab44efc9091025d5b6b21b0b

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