Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f0b326722e7c69…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 14:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b19301d8ab3d86cb7c3430c7f3f11ed SHA-1: 550788083a13826a78b64c3c47d2667ef3e48f5c SHA-256: d4f0b326722e7c6908c23d12e7c476f305685cf44a7f11eb205659117acc8d6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://perksys.com/userfiles/file/47254248110.pdf In PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/jigelanedikevixipig.pdfIn PDF document text
    • https://hoavily.com/uploads/files/miretimopulufibaw.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/kalenogesuwotede.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34515345636.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/83862117735.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/89103772498.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/duvewegawisarube.pdfIn PDF document text
    • http://esistore.com/userfiles/file/xememolevaw.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/72pb66ga8pd32sirvo77fn97s7/99083457219.pdfIn PDF document text
    • http://zubrcup.by/files/files/56271132538.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/lajorugotavojawad.pdfIn PDF document text
    • http://rhondachem.com/d/files/83921185066.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/kewurogi.pdfIn PDF document text
    • https://lorus.rs/files/99052582116.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/21338090007.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210914_7CC79612DFFD496A.pdfIn PDF document text
    • https://geloracinta.com/contents/files/51864406553.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210918_15EA16C6B19FB1BF.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/voxulavezudijiliriv.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/5287335913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+colors+are+mixed+to+make+orangePDF 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 11004 bytes
SHA-256: ab4f7e9513fc2e3e13ee4b4b93186128e86319f1aa6df874def0a34939f820e8
font_02_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 18076 bytes
SHA-256: d7b80426a6533130c0cfef8492aaec2ee81a78904dd40764811534b382241045

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