Malicious PDF — malware analysis report

Static analysis result for SHA-256 0814ee048112fa12…

MALICIOUS

PDF

73.6 KB Created: 2021-03-23 21:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7d8e8a73b34b2d2f83a0d0b913216c4 SHA-1: ed35326f12acca4f156759c0a6b5b626523bdbe7 SHA-256: 0814ee048112fa125137bc8a21191a1a2650e7632dc7bfb4081e07fceea5917c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://nipisod.ru/123?utm_term=common+laboratory+apparatus+and+their+uses+pdf, which is likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/123?utm_term=common+laboratory+apparatus+and+their+uses+pdf PDF link annotation
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/08f1f40d4d051.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/wixijonefuwugilirale.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/sebusadewal-puzavem-kunuve.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/073ce7743f3f0.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/vebesofem.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/dawuletoxafose.pdfIn PDF document text
    • https://wemivera.weebly.com/uploads/1/3/4/3/134311686/visiruduko-litujireniwitaw-mupanone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_1cd50705475848f581141edf0604576d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/logo_quiz_level_2_all_answers.pdfIn PDF document text
    • https://8209d2ef-2bf5-43c2-9db3-ad37d88374b4.filesusr.com/ugd/a58502_745a43c58a60450dba3e20ea0a0f92c6.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_7e7a0364bdf0477699e03a02ad9604e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/collections_book_grade_7_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/hutchinson_island_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf37121-eec7-4174-abe7-8313a76d2d3c/how_much_should_i_expect_to_pay_for_a_logo_design.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_3cbfc4641a9e4b98a2a7508d3e09f347.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_b6513398f37341079cd550234e5662de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/kings_college_taunton_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dcc0cc-a9c3-4a00-8e92-7def10a26f62/6909832931.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 5428 bytes
SHA-256: 0e2369b61eef927573ce1cf684ca2f959571ba6ac453bc8eed025a0ee693d7b9
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 11096 bytes
SHA-256: 50bc5ba03b819c6b7bc2a1235194558871bce13f3e521c1b02ba074675d70c82

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