Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7555cf5373ddede…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 02:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fc61799dc63d403073c073a1a359b90 SHA-1: 635c4279c0d2ebc2d4e961b8ecd36bec3f05b69f SHA-256: c7555cf5373ddedeae6a358b9c7e0784925b4fa47705fa0e10c1e9d571d78cc2
126 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content or a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://aqua4you.hu/userfiles/file/1852602566.pdf In PDF document text
    • http://kemnhapkhau.com/upload/files/tirosotowi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148197b4ed6b---giletobalop.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5c5c550932c7f9fcef47d32c7f560b85/66591783274.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/mivev.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/gowurojasimoruzozep.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tutosu.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/bejabuliwoniborawanud.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wovewugapajuwusawawi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mepizuvutu.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/66753694691.pdfIn PDF document text
    • http://friulanapanini.com/images/file/8983132487.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jorenuzez.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/tijamixutunu.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/80656747354.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/ginopopigojanososarozur.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/44426842381.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/wulox.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/lanigikabesodusaxiba.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bigigafavasozozene.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/44759820957.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/43232485412.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192123084997.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/68697431289.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/48927473812.pdfIn PDF document text
    • https://theipbuzz.com/images/file/63015411766.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/lukagesuromutixus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chal+mera+putt+2+watch+online+downloadPDF 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_off0000b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 15000 bytes
SHA-256: cd790c4a7adfb0ecb6b2863183a6b08d0e7dd3d31780aae660a567f56e100cd1
font_01_sfnt_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 10948 bytes
SHA-256: 5cc74e0063f117e75cddb61a8d340a687ca529f04125b9340fbe255766bc958c
font_02_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1