Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c2cfa30ece548c…

MALICIOUS

PDF

116.7 KB Created: 2021-03-23 07:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 190ecb7947fc524e1c2d5c8379430c13 SHA-1: b9e3e7ea52c0eb6c0af02e2dfa914a7972a34cbe SHA-256: c9c2cfa30ece548c609ed2fd4b6dac68db5b213b9464e7c686e5ae3140517944
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=tmb+barcelona+bus+map+pdf
    • http://kowuterada.mygamesonline.org/pdf_taqreer_books_download_urdu.pdf
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5fda5d5e9418b.pdf
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/29923670107.pdf
    • http://pusovemolexed.scienceontheweb.net/energy_storage_batteries.pdf
    • http://luxasireku.sportsontheweb.net/dofipi.pdf
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/7086450.pdf
    • http://lalomul.iblogger.org/calendario_2020_colombia_con_festivos_y_fechas_especiales.pdf
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/4473820.pdf
    • https://cdn-cms.f-static.net/uploads/4490949/normal_6041f22d67f84.pdf
    • http://fasajesova.22web.org/66635507591.pdf
    • https://cdn-cms.f-static.net/uploads/4490974/normal_604a2bd7cf11a.pdf
    • http://lagujegivupani.22web.org/34726954591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dumojefupu.rf.gd/sukoribaxabaliduwido.pdf
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_0348e9c022384af897981c4675de2dc7.pdf?index=true
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_881688b1f9aa46f99b61c6b04327af14.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_b468c0dbb1994573861f75841877e53c.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_2b83740613a046d0bba956ca8b02149e.pdf?index=true
    • http://pusebirenox.myartsonline.com/57859169907.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e3.bin
54a5e70dee84d0d81f90749a2f1dea691cd2a5f877a8b7a9bad4fdb36cb760b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 42480 bytes
font_01_sfnt_off00018a03.bin
317bbf633c69d32fb40add3150840902a2d164b8454abf309e1300c3738b221a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A03 5392 bytes
font_02_sfnt_off00019c38.bin
52ddcc17660aec08669039ef3c6b8b22aa6350e424f15d9827d31e1b74be1b9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C38 11404 bytes

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