Malicious PDF — malware analysis report

Static analysis result for SHA-256 d297cb860c2f905e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 19:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d16368db78b20bbdd787ba1455f534de SHA-1: 9e52e3f997aaf70c6b67aec4e6661604a638625c SHA-256: d297cb860c2f905eda292a11f5203f31e43baa31af7943131cca022a965357df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jshanwoo.com/ckfinder/userfiles/files/vijajigoxofigufuvav.pdf In PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/gutosodupiwuwitebata.pdfIn PDF document text
    • http://ccadl.com/files/20210831124540.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/davawatusimixawa.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/dugapileluwixazo.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/delekoruxepekiwik.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/gitisejaxurinatevirevire.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/37012464119.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/54970406552.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/36347504697.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/dovaxuzanebuzime.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/79712849494.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5746f0c7e7---20807569210.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/1709583882.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/47415816927.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/danulodabewaxijexemube.pdfIn PDF document text
    • http://chinalabware.ru/d/files/21504790000.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/92990558974.pdfIn PDF document text
    • http://saimiri.name/upload/file/jutemofojofizubega.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/mifatopoxegikatipetu.pdfIn PDF document text
    • https://maisonforville.be/documents/file/98351941058.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c272260a397---79753538697.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210823190709.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vetofibozax.pdfIn PDF document text
    • https://yuss.it/file/79148500034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clek+foonf+owners+manualPDF 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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 10492 bytes
SHA-256: e8b999464a3633ef4f1f8e998a181b8bf09a6480d69eee202c30df52748bda7d
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 18972 bytes
SHA-256: 95f42859d88e33a99e7b9dbc83c22ec5d050da377bc041114ac275afe545604d