Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff00032073e742…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 10:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fbb7e578fd81aadec0bb1b603332f07 SHA-1: eefa9a9f507966c9f018f640e781450a1b240d45 SHA-256: 0cff00032073e742e7a345f1d02f5ddf177314b3201f27a625c05fa89b075e70
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it exploits PDF vulnerabilities to execute code. The PDF also acts as a link farm, directing users to numerous external URLs, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript and external links points to an attempt to execute code and redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bangkokmagnetwire.com/ecodev_test/image_system/files/56230452921.pdf In PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/51420045003.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/45131923679.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/fufodewetazat.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/080213238709.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/34257591182.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bopogumo.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/5567064819.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/47204451219.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/komobirulas.pdfIn PDF document text
    • http://synphabase.ch/upload/file/61786554221.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/sapawuratobefuladirisixap.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/7129340514.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94518910639.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/9644550648.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zixuburirerowoxevodenove.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/57315942553.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/sofudujil.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/oki362ssh6dtiqi8aod7pu0gbak7d5v7/94026788339.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab4c0b8b7---14373422482.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/1364978156.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/vutuvakokopofolamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=piazzolla+tango+etudes+violin+pdfPDF 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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10800 bytes
SHA-256: 9d7963eaebba9b79e26f64bba169f0a26f228b63a41c19d5050d3149829a6b0b
font_02_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 18456 bytes
SHA-256: 21e3c44c77d48cb932c02cd1957bac929415528b9be10c073ed7c65f42e08f06