Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c122ea22d6b42c7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 16:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 45667b65e19a6efff1a71f945ccd5551 SHA-1: 21b9fd6e452417ee0f409929c8f1275a77262ee0 SHA-256: 8c122ea22d6b42c7bde05eb23f305808d530f1ca929a7b9c1c5b4c7b5ca9689b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dxqzx.com/ckfinder/userfiles/files/20210917_134221.pdf In PDF document text
    • http://startmatbaa.com/userfiles/file/lulinimudodubeposulebofe.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/29069489332.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/mewilaruvagofotozepira.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/87fc95c0b9b056aacec568aa9f880b9d/ditewuzimux.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/21424617259.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/rugugejizutalad.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/62921747158.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/4212072675.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/penivuparaguro.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/zebebo.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/29419260213.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/50754951853.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/87183766485.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/35132263382.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/44836264527.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/lirelovukasufidonuvir.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-17/1a7c66d3d9be7e5e68bc6b868961caad.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/vapexen.pdfIn PDF document text
    • http://th-hl.com///upload/files/timizotedonuwijubivakoz.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/82535281828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=video+on+demand+apkPDF 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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 17236 bytes
SHA-256: 0740319808d6753b2e1db7bc3ba074494afb90c26bbd684856be0a80543aa38e
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 10204 bytes
SHA-256: 1e63cbb6e8068d7694a0981bb2237a6b2078ec8fb58c879b3578473a661d4650

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