Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffb0e11cbeadc49…

MALICIOUS

PDF

87.1 KB Created: 2021-04-22 14:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5f6d107c62afb6fc03551100deae9f4f SHA-1: 51ce5b783d9d0d3b33803de8cd394c4dd747d076 SHA-256: 9ffb0e11cbeadc4997728b4cce69a41b46b7f32f005c97f78b73963efe3a906b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical ClamAV detection indicating it is a phishing or trojan distribution. The ML classifier also strongly flagged it as malicious. The document body, though heavily obfuscated, appears to be a lure related to a book chapter summary, directing users to external sites like seumenha.ru, which is likely part of a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=after+we+collided+book+chapter+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408875/normal_602ca0a402486.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/base_de_datos_mysql_ejemplo.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/95978968565.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/godowa2m485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fe9ac58676ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_604e8d9337262.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/73704511779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_603c431b64f48.pdfIn PDF document text
    • http://namelesssouth.xyz/aba_pairing_data_sheettpqwc.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/canary_tokens.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/beziribedulesizemeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6014dd8a51125.pdfIn PDF document text
    • http://politach.com/tevisakiluka3ht2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fef11f583d61.pdfIn PDF document text
    • http://air-calm2.club/pycrypto_python_3._6y169v.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/50224992435.pdfIn PDF document text
    • http://makedctl.site/depavolisisogezedurekivil6t3j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5520c51-667d-40ab-8d53-55ad7c08d06e/sajimevogusugewisunipopu.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/xoxomivedunuzisopap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60a7f3f-2d6d-440d-8851-d29b0fb5053f/69406565634.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 5784 bytes
SHA-256: afbc9a4bbd99ebf8918e0e4eb638dac14c5054f929b1381249319acf3671324d
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 1772 bytes
SHA-256: acc8e4fc1fa6fc0e1ad702546ec63c54288dadfa1d6d375f487903e315e5a1fb
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 10696 bytes
SHA-256: bdff990f58da5ad9414dbb0c5c0ae20941c7de7ae2b6674f332a82f2816a97fb
font_03_sfnt_off00013a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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