Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f15e2f53c220399…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 13:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbd4183b7c6aab9561c466f987343103 SHA-1: cd3a52ffab91270b61a0d9f997a3eba73c52be46 SHA-256: 0f15e2f53c220399999ec5630b2df119061abb0ac1e1383f85a81a1a53fb7df1
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for downloading and executing secondary payloads. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://promobryansk.ru/userfiles/files/69883495296.pdf In PDF document text
    • http://pk-rowery.pl/user_pict/file/43535755582.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/xiveroditexoxatuxaxiwiko.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea356b4586---17237681309.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109021012409895.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/47890390218.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/kibedokurabalanufemaki.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/29366189182.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/97441044724.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/6916088254.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/zizadoluz.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/wiwezoruxo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kubeg.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/56745629225.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/18806261700.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tazememazudotosilodiseji.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5ea9df79aa8b222bbf6dd09ae62ced63/53192769105.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/33226231620.pdfIn PDF document text
    • https://atlantidegattico.it/file/tebakat.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/16156840037.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/zuvufamujuda.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kosofulatamewizuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=knowledge+test+handbookPDF 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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 10644 bytes
SHA-256: 6f52f765c7cf7c465a0d725634e38a04e6301706a0f892c3c184b39a393492a9
font_01_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 18984 bytes
SHA-256: 6739a605b6f1568f605db6ed75e0f664576f0c6e1d1fd77b9f58a35106aaae7c
font_02_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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