Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67996eb1ceb969…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 17:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f35df6d275e8d158679fa016ead65390 SHA-1: f1261de09e47ea8141f6b762daf20385799ec290 SHA-256: 6f67996eb1ceb969e0cccf0349fb72235fb92b407fbc605d1661e8e151f5587d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://emke.hu/uploads/ckfinder/userfiles/files/99892090064.pdf In PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/joloxolamo.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/bubulivuzifigawovenimuv.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rizomijeguvewinij.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/61397946723.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/nuduvoxel.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/totitizerala.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21837531244.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/77440047086.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59270793770.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kiloxunumalegije.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/fakefubepanikelewakirum.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210919190211.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/motiwelo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/2917876811.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/dobetisoxigisibok.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151205034872.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dc5965c7---tokakubudepul.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/64474395393.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/wodosetapideduwad.pdfIn PDF document text
    • https://alutat.com/data/file/74705651785.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/82535594244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=beiimaan+love+full+movie+download+blurayPDF 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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10808 bytes
SHA-256: eeebb0ced9829a46558d884f6e250d8fcf13eb17b0a406f41f13391368faef16
font_01_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 17620 bytes
SHA-256: 098ce42ef8bc364c6a5da1243287d3764d18c77cc6eb8f211d5f7c0ba133e6c5
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1