Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec228cde1410a5c4…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 04:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bd6878a7aa8b6b422e304c217da25966 SHA-1: 7221868f630062cac4a0147fe83a402dbf860353 SHA-256: ec228cde1410a5c4141b5a276ecc1fa31152f06f3369970070903dab2b0028cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://kuzutuzo.ru/award?keyword=free+excel+vlookup+tutorial+pdf PDF link annotation
    • https://fojakodi.weebly.com/uploads/1/3/1/3/131379163/vagepemu.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/how_to_make_an_easy_paper_airplanes_step_by_step.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/4b7c2c.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/435550.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/73986203983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_c2c3b40fd470451d9391d27ac9c51f82.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_7fe0b601807d4720b541ede57df4a943.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_9076b614b82440dc894a3de07a90eb83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/wedebovuwume.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_72de7c292c6f4a268574ea3752abfb37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/punctuation_paragraph_exercises_for_grade_4.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_363951a6d0cf4b79ada352179a6945ec.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_d7458bdfdd6d4a94b10cc643da2d34e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/94962544794.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_1a8feb6ba3644739bacdb2514b909b56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/cinderella_story_file.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_ff4d63fcf11a46ceac50e3e36e64a82e.pdf?index=trueIn PDF document text
    • http://fidikaxano.myartsonline.com/angielski_sownictwo_c1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 5120 bytes
SHA-256: c9ffa772d207a9bab17d7f9924680e7718fcb3103551619acf28abdae3055bc8
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 11184 bytes
SHA-256: d94a3b37882618edb6a2b3fb484caecae4b5dbc6f0895658d908a1994e2b67cc

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