Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae7c450d71922fb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 02:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb60fb2a92a6982a15c0cd5790afcd01 SHA-1: 5c1a39387e6ff49aa648ca8b3993e4da91cdf787 SHA-256: 9ae7c450d71922fba088c0cf835605e3e2aadd0369143f70cfa771837d052225
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF is also flagged as a link farm on disposable hosting, with numerous external URIs pointing to various PDF files. This suggests a phishing or SEO-based distribution scheme, likely using the embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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://morakothotel.com/file_media/file_image/file/61063686832.pdf In PDF document text
    • http://adas-muko.pl/photo/file/35029094784.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/99770348083.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/zulekawelifukobarudira.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zulebijuzu.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/86283807346.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44742230405.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/wobasidepedepaxebup.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/95124680164.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/rewadaxunupalolexonusorej.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/20467077773.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/subexovanuno.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210928_061829.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413d84474b8---35126374302.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tejiregovafixejagetowamu.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/samekijubazoderimela.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/sadigajusofakenekik.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/sosolisu.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/55246696491.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/perefuto.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210917043031183.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/89806140501.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/gafajuguja.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/katefulufexufilekasi.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/dobarusobelukogibilavuxop.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c362d4dbca3eefbc65ff37c7414d7e9/39990553470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=apa+citation+edition+7PDF 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_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 10224 bytes
SHA-256: 23f5d296f193b7de0d3443f4bcd5ddc38ae3842c9e7b689c5f1a88ee9301cd31
font_01_sfnt_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 14632 bytes
SHA-256: f22a4ee42e50577e82b2b98b20304acc9ba22b7dd49c596d2252f8c208b08525
font_02_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1