Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e604762de43de…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 18:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d3062d1e555c0d290ee78b48c2eeaafb SHA-1: 22d389e150f13800b27b8d7aecf4c4ab5f012dea SHA-256: fb5e604762de43de2043c3b6dd33d85d112f0cf3313b5ac156b9dbf9dc71be54
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a payment redirection lure. The PDF contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to obscure the ultimate malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit vulnerabilities or trick users into downloading further malicious content, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pecintajp.com/contents/files/pakilujakefegezotoja.pdf In PDF document text
    • https://hlj-vibration.com/uploads/image/20210906/files/20210906180230.pdfIn PDF document text
    • http://carszana.com/image/upload/File/99756596543.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/11934277429.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/vodajakolisuvobinadiba.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/37596175164.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/36523951572.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/73283518350.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tesonoxivawofiguloliwe.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/8445314520.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/26551466180.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/kesolem.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/sodaw.pdfIn PDF document text
    • http://sb-78.ru/files/file/95480417501.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zibevurixifegapedotugone.pdfIn PDF document text
    • http://polipack.ru/content/file/tixuweseponuzafimuzi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/kavopebaxukigebujowinuxut.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/80817809046.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/71219979513.pdfIn PDF document text
    • https://loyd.rs/images/file/48661059017.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/desepefijapemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+pie+goPDF 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 18588 bytes
SHA-256: db917f76e90122c861a1fa1c145e13798db5d3f3d58e288fc8f50916951f40e2
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 10072 bytes
SHA-256: 45966c6fc44a29e04df57f80775dfc7d011754e86e84db164e7b760dd180882c

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