Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9d0c2f7cb5a216…

MALICIOUS

PDF

232.2 KB Created: 2021-04-01 17:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87bb4a286de91803223ece7e544b1f5f SHA-1: 8212c849a20b8aa602fc6e609a8d6adbe65a8384 SHA-256: 0b9d0c2f7cb5a2163ce97ab12127d925bf398ea4adb19da9fa250aeb31eb70c5
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely intended to phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=malayalam+amman+devotional+songs+free
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/2112504.pdf
    • https://static.s123-cdn-static.com/uploads/4447906/normal_6008e26e438c2.pdf
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/vugefijapuve_likoseraxa_webixanulu.pdf
    • https://cdn-cms.f-static.net/uploads/4476427/normal_600fe330d6eea.pdf
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5fedaaa25aefd.pdf
    • https://cdn-cms.f-static.net/uploads/4415300/normal_5fe922d6d9c73.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_605a9448d61d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/31dbe415-8861-4a56-9a9c-1f0e8698946e/38106381886.pdf
    • https://uploads.strikinglycdn.com/files/1a85a5ee-f7e5-4abc-8838-ce4a5145c031/surok.pdf
    • https://s3.amazonaws.com/pisik/comptia_linux_xk0-_004_study_guide.pdf
    • https://uploads.strikinglycdn.com/files/98b7eca0-ca66-4738-8dc8-a4906684ab65/percy_jackson_the_lightning_thief_book_character_traits.pdf
    • https://uploads.strikinglycdn.com/files/d03c67bf-332d-4d0f-a0f4-45f2aed1b8e9/figopikasu.pdf
    • https://s3.amazonaws.com/juzowilipi/xowozunifasejelumuruka.pdf
    • https://uploads.strikinglycdn.com/files/0c41d0c1-bb8a-4d29-8ff2-827e48dd155f/14499721380.pdf
    • https://s3.amazonaws.com/fidobakipivogit/corporate_social_responsibility_and_environmental_management_journal_ranking.pdf
    • https://uploads.strikinglycdn.com/files/73e3c7ee-295e-4423-b43b-cd636c3e55e6/asus_crosshair_v_formula-z_bios_flash.pdf
    • https://uploads.strikinglycdn.com/files/31473680-3f96-4703-8455-f5cb563831fb/sewitudumikixifozamijom.pdf
    • https://uploads.strikinglycdn.com/files/a28cb7cb-3a29-49a8-9caf-05ddf585d5d7/wudonibug.pdf
    • https://s3.amazonaws.com/lekizopiloref/sound_quality_app_free.pdf
    • https://uploads.strikinglycdn.com/files/30c512ab-0294-43e4-adc8-758ca3feefe0/juxulezazowuxunudevuromet.pdf
    • https://uploads.strikinglycdn.com/files/d8c234a0-e51c-46c7-a0cc-dd7702837659/22609280350.pdf
    • https://s3.amazonaws.com/sedowedi/92857065472.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00035c7e.bin
da25a5b786f03836c162d4f2f3a87c69fc67a2b256f55e4931c790f712223e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35C7E 5396 bytes
font_01_sfnt_off00036edf.bin
264412a2db44ea9e3fd032de64e2a4235d8f98d944ae43973fde01c4ab39b884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x36EDF 10996 bytes

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