Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe90d4a128117a7b…

MALICIOUS

PDF

66.5 KB Created: 2021-09-12 19:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b475534e7bc1f29b008ba09c7d08c724 SHA-1: 0c5a1cdce198a0a82612fae0d983bf1e320ce741 SHA-256: fe90d4a128117a7b0e34f6b54d0e38cc61ee19330fd547da21c822ecab79f31f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Multiple external URIs were extracted, indicating a likely attempt to lead the user to a phishing page or download a secondary payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6961

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.
  • 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
  • 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://www.neoneophytou.com/ckfinder/userfiles/files/tabodobidixixek.pdf In PDF document text
    • http://szm.hu/userfiles/file/fazuzunarafozasozidebew.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/90092401513.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16425860286.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/24939288949.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/mugadatitusibew.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210912072024.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/77353662859.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/juwudimo.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/lofokabeva.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/62429955648.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/64873758641.pdfIn PDF document text
    • http://coolscape.info/images/files/51368834623.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/koxuxedifuzibijurusevad.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kunuwivuduzabamuzawul.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/vemurebimilepidalofobelit.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_124843.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/sowok.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/74956474486.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210901_22_52_4.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/32826585436.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/716f53a442f81f4d77fdb727d1d5fc9f/43653159857.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d280dc2ab---sozuxobonifukanuveli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nvisio+apk+scanPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10128 bytes
SHA-256: 7dbc65fbbcb4197359f6d3581b6b34ea761294612f4872e79948bb16acc7cdfa

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