Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ed1b4c6897fb20…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 23:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7c8ef22da7230a5925d556bb45ec825 SHA-1: e47d1c347a0921d483aa3872106ecb95d2e7ef87 SHA-256: 42ed1b4c6897fb204e6dd4a4969cb3a974814b82bd96c0c3de21735ef5011a9f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate a strong likelihood of phishing or malware distribution. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4151

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 https://maryamghiasi.com/images/upload/files/70172801206.pdf In PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/63104777525.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/37228769301.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/7642729139.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/zekakebedadinipavawegus.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/37305070583.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613040dfc873d---dotofikinomo.pdfIn PDF document text
    • http://juncheng.tw/upload/files/jokofafutofabeximude.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/87543567628.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/makoxujusafebunoxesujiro.pdfIn PDF document text
    • http://wuchem.com/upload/files/luvadisebozevaxub.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/20894700571.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-9/20210909025434180307.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/48866317453.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xizikupisulagut.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/79134282752.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/segufamaravonate.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/pagilaned.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3371443895.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/60136686482.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/3200322680.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/65828797857.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/13559523986.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/dipaguvazorerefewelenizu.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/38578448117.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tevipubovubakawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=robbins+patologia+humana+pdf+gratisPDF link annotation
    • 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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 19212 bytes
SHA-256: 144aae467a77903ad037bd69ee9d57c5241ce3b96e27502fde5c676415d89a1c
font_02_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 11096 bytes
SHA-256: 3c012dd599532deb39ed2e0786904200bd3e0cd0c1295839f0b1819426813675

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