Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d656efc2dd2e8e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 22:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a0ab8f0dab1df5b1eefc3ba0593107c1 SHA-1: 41a3409fc416e01366d9b3b1902cc6f01c469f69 SHA-256: f0d656efc2dd2e8e99d5f568fbebc1039155fc1320ba8f4393ba9cd2607eca14
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external URLs suggest the document is designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://eot.mn/uploads/userfiles/files/35506432989.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908185827.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nuxuso.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/48159625319.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/42001581211.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fulibalotomavijakuk.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/60701025482.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d9bcbd8de02f852e5ab18202b62531c9/jokiginozakuvobezekajovu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tewunegugabejipamikezixar.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/puvimi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/26572825855.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/movasugej.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xawumaxinezozumokipaveso.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/jawaki.pdfIn PDF document text
    • http://melabo.com/upload/files/72330278498.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/75598882238.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/46619711251.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/47001653928.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/megubarusatife.pdfIn PDF document text
    • http://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/40114650095.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kunex.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/xoxufuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=router+key+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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 10188 bytes
SHA-256: 273a0d755734427ff809a37f1703c89edddfc248eb4e00b231d51b8a9605be78
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 18656 bytes
SHA-256: ae889347243c70941a1450ce8c9005a0be8b0762728b0d89d99025ae1913a59f

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