Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fbbac40b513881…

MALICIOUS

PDF

73.4 KB Created: 2021-09-28 13:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9264bf4f701968e7e497af13a62df54b SHA-1: de739f4291c7b95bbd508e6cfeee1e14b9864a06 SHA-256: b1fbbac40b513881ff8101171f020d343d698048c70f468048e8901407bed955
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is often used to execute malicious actions. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the sample, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://sergeisurzhin.ru/ckfinder/userfiles/files/24102962336.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/vewefubetifadijisugewet.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/77113976642.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312466426567.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zidawovuvom.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f1bb4b0d3932de918873ea52886d4f27/juzudukokepikesarige.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/deveneralipotoxekukat.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/11776769656.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/37751313584.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16542372246.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/tbojgnmoogv1i21vpckvdho7te/dotodofemojiruzivotiduno.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/fukipi.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/pebidixorid.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/81418208993.pdfIn PDF document text
    • http://ellev.fr/upload/files/73146768088.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/soxokufokiberalaz.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/mefif.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/niwududevul.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/73117921378.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/pufoxizotado.pdfIn PDF document text
    • http://trevorhannant.com/pidisefotutas.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/xemazigejumizisilexibugov.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/90415655356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+se+price+in+bangladesh+2021PDF 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_off0000b49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 19244 bytes
SHA-256: f4dd4bdbc0f70a42991075ae83bedba3d57e2e07a6d9eab8b20f6514d89c2d43
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 11080 bytes
SHA-256: 29507e78496cb43e0781aa2873e80d6c76914760f1ae730948d0dd63cb886234
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1