Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ee571533e4928…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 12:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da3b428a782e5eb04c9417a80d030807 SHA-1: c9876642d744ae436e62879b5630f4adcafb4f84 SHA-256: 823ee571533e4928feab5f864fa5ba3dfd5934d9081397bed3253a848b13a83b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ketchas.ru/uplcv?utm_term=is+wanna+a+word PDF link annotation
    • https://europawindow.com/app/webroot/img/main_content/files/98133872322.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/73635782683.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89481d46b---1993894152.pdfIn PDF document text
    • https://stopserv.ru/files/file/sameribaboligabelurefad.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/zeresakikerar.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/mozuwetawovorevadinaku.pdfIn PDF document text
    • http://hotstamping.pl/files/file/zirubowivivoxaxu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pogupedobudofomede.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/lanilego.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zajelimapobo.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/zewomasasano.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/27174027350.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kewevumufutoxukiwabupagek.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/duwozafikafebotalof.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60558223674.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jazodewizatugawuf.pdfIn PDF document text
    • http://dgkno.cn/upload/89186734361.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/rugebakuxupiretonuturi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7d3436144c89f51cfc01a7dc3590fd46/47581609259.pdfIn PDF document text
    • https://isleo.com/i_photos/file/gafap.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gilegajiwifawiveso.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/11896533507.pdfIn PDF document text
    • 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_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 16384 bytes
SHA-256: 2a324ea44fd726859f21f4a77afe93b484d47d0611273eb8e1941f7cde217c79
font_01_sfnt_off0000d712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD712 9912 bytes
SHA-256: 3e7c1d9c5a56c72464d64572da8cafd1bc3fcaafff98b088cb6ee8a1d5a7d659
font_02_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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