Malicious PDF — malware analysis report

Static analysis result for SHA-256 379a536c92eb9642…

MALICIOUS

PDF

79.6 KB Created: 2021-05-14 20:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c9a436c685f39c0c97168b6a890d94f3 SHA-1: 5ab3520e9bed2fadfde9fe576b0fdb4da541e5b6 SHA-256: 379a536c92eb964294607b0bb8efe4c10fab360785b1304440b07a44670bb78c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=how+to+display+object+data+in+react+js PDF link annotation
    • http://winoorama.site/40051898730cr4pd.pdfIn PDF document text
    • http://coins24h.com/gibolixivapedora058l6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_c50149c1afff451c96d46d3a43fe18c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/81224377108.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_44894976ca4346918c2e10851c407160.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/tyvek_flexwrap_submittal_sheet.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_34e54bc9aa2645878cbe57b3dcce19a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegek/45813506816.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_7549ea196df646b5982dad22805edea1.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_55b9d9fd770047be860ad10ed56bd0ad.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_99fc99539662407ba294b0b3ae5f3dd1.pdf?index=trueIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_e5ad9b19393144a88b7659ee5ac1201f.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_6b0906ded02044f6b0c1877eb25bc234.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_688f2f98467a42b897e127acb0ca7c91.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_665576af5d294b4eb00744b8d1563dcc.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_1253c09b07b9491daa84db2956d188c1.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_6143a283fe8947b9b786bb6a8f4ca796.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/umbrella_academy_comic_volume_1.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_91ed315a9d464259b6ec09c0dfa06ff5.pdf?index=trueIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_84c7d4859dda419981cc52838e22136d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/komagabivumekurezi.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/6875623617.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/18988639091.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 5436 bytes
SHA-256: 162daec032f333485d08570b4d15a404e8c4130e369f55c8424143c5505bbb0b
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 11068 bytes
SHA-256: a1722cca7b63052f31088185960fd89716c0d5a5fba410611595735722a72351
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16300 bytes
SHA-256: a9c2debbfb7262892b4615e5847c2f926084887f8d65235e0e6866ea9dbd5ccb