Malicious PDF — malware analysis report

Static analysis result for SHA-256 37095b45bf6cc3b8…

MALICIOUS

PDF

87.8 KB Created: 2021-04-01 04:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cb1dee245ea75d5f34cef34e875693 SHA-1: df932c7d96a3e4f7dcfe28689fd446e03cb2dcac SHA-256: 37095b45bf6cc3b8444660f5b49def617ee1a91d02019af08362222679f058fc
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are generated SEO-style links, and one primary malicious URL. This suggests the document is designed to redirect users to potentially malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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/wix?keyword=santa+rosa+laguna+postcode
    • http://tajevis.22web.org/76784347396.pdf
    • http://dinudavap.iblogger.org/sarikiwanim.pdf
    • http://wubegewefek.iblogger.org/professional_google_slides_templates_free.pdf
    • http://nosatines.mypressonline.com/vejabutiwapurazogupova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_ad5783aee93d40809745f07adc58d02e.pdf?index=true
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_58e1647ec9624b45b45c7e4c52bf710a.pdf?index=true
    • http://sodexodape.rf.gd/how_to_expand_polynomials_with_pascals_triangle.pdf
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_bba427392acc45e58d2950fd08033304.pdf?index=true
    • https://s3.amazonaws.com/savukojubusum/naxorofaberezosuzu.pdf
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_c71382f197a14785b6a989ed6e689313.pdf?index=true
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_2d549887064143729d3354b94baa1cc0.pdf?index=true
    • https://s3.amazonaws.com/xamibebulosaxug/grattan_institute_report_naplan.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_616f25b29ce04ffeb421da21a7eb4df7.pdf?index=true
    • http://wilaroxu.atwebpages.com/cetoacidosis_diabetica_criterios.pdf
    • https://s3.amazonaws.com/rubidokezive/10_march_2019_amazon_quiz_answers.pdf
    • http://pikubub.onlinewebshop.net/capacitores_fisica.pdf
    • https://s3.amazonaws.com/muvemasoxaji/cloze_test_exercises_with_answers.pdf
    • https://s3.amazonaws.com/lowuwofuxali/12728199024.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_9fcb3c2a41284a92a7a788a8eb32a65b.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_b3bd8edd11c54f3db894c47f689946ca.pdf?index=true
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_39f4e1ba0dfd4cfebb529d01034a9453.pdf?index=true
    • http://bumurulepowele.myartsonline.com/73738654955.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_off000116e5.bin
aee73c0452330bf0ccd90b4fa6e4839e6cd25583a46401541f9f82fb04f77471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 5344 bytes
font_01_sfnt_off00012918.bin
c8caa274f25f2ab971f7438a52cb3a79c51c59dae0cfced272cc7b464503ed56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 12068 bytes

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