Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48ecdcca79e8671…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 02:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c39a753207b8f12425a0b01736ca3028 SHA-1: 3ad72172ef115f92bd5ea8511aac04a3be9c0fdc SHA-256: e48ecdcca79e86711b62a58c759a7171cefb1f21562bf43ee4ab36c979773abe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://rongqichem.com/upload/files/ritezodazajesid.pdf In PDF document text
    • http://go-pxl.com/uploads/files/7684133698.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/diwuvivonejedalufujamoza.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902030655945686.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/60817906525.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/dedujira.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/68511093048.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5aca9e7ed7130656980952d9d36ed3c7/gesotupubukum.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/97c8048e849d486347f774c898d0dee2/90229849563.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/73774384411.pdfIn PDF document text
    • http://cnc-ar.ro/files/file/jogoxinudonopokozesapiwab.pdfIn PDF document text
    • http://suaups.net/userfiles/file/59915819096.pdfIn PDF document text
    • https://hssanesteban.cl/files/xedikevadofudimux.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pazufurebitunufo.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25835660042.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/ledopapamafezam.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/38708665362.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/laxuromigalubirekobixa.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/82301061238.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/22493602556.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/28104812818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mega+hit+poker+unlimited+moneyPDF 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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 18256 bytes
SHA-256: 37ece584fdc9a4b8d7fdd2863848f7b9fcaf06918532ce747567b814df931549
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10968 bytes
SHA-256: 6c58363ffb8c741d886bfdf734d6438a57426eda921f7ad8adf2cebcc838906e
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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