Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1b037fbc275d96…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 14:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6af6b927a6cb1c97e500db3579e8e63 SHA-1: 43e509f5439309148c0f71223cbafafc51047733 SHA-256: de1b037fbc275d9637bb90f4e1a08a68ec9ac4a3fc863cde11206cf3015f3c4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains. This behavior is consistent with phishing or malware distribution campaigns, where the initial document serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/97887424faef3bfa8f2692b8a64ceb77/83155086834.pdf In PDF document text
    • http://happycondo.leaddeehub.com/userfiles/files/kosar.pdfIn PDF document text
    • https://ibericadearmerias.com/file/lonefuf.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/39542153320.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/sobixexirirebokupur.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/7084756551.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/poriderileputetutode.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108312012145014.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed66e2634---nilogi.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/4397614565.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/mukadoxafaj.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/tufesigo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109080908394233.pdfIn PDF document text
    • https://preciseenergygroup.com/media/71627754227.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/nufufijos.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8021808166.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/93120040370.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/rutawinesejasevujamanaj.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/neganulizu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/dinedebeze.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/88530276306.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/13515105964.pdfIn PDF document text
    • http://kezheng.net/Upload/file/jexevosubapulewebotojod.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/felaxuzojosekap.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xajujojotegidorufumatafi.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/tojosizigegelolos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=corporate+governance+report+pdfPDF 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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 10584 bytes
SHA-256: 6dbbec8facdaecf8a1ba8191da29ba41ef937325b2710e7d92ae6739725237ed
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 17944 bytes
SHA-256: 2311e2fb426b2dbce631256926dff254f9106a384d530402b95bdfff2a7246db
font_02_sfnt_off00012843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1