Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cee99e427adc7c…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 10:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0550e6fae1f74c9b6b8f016fcae26c52 SHA-1: 1194acd1479386e900702d784447134562c088ec SHA-256: 86cee99e427adc7c4b1a3170a808f2d03514b8690ea9c2245d7389b07001ad15
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 0.9992

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://resalured.ru/award?keyword=controla+tu+hernia+de+hiato+pdf PDF link annotation
    • http://vivoxasoro.22web.org/sokibikakitaweligalu.pdfIn PDF document text
    • http://jinokonur.22web.org/what_are_the_200_most_common_words_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_dee33e05260c4f5a9094292da10d14c2.pdf?index=trueIn PDF document text
    • http://zoniguzetixan.epizy.com/docket_sheets_california.pdfIn PDF document text
    • http://suzumusazudub.epizy.com/xilodedurebesigewato.pdfIn PDF document text
    • http://genenapukiral.epizy.com/zaxizuzafagig.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/xifajatazan.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/79535113908.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/dancing_ballz_mod_apk_1._4._9.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/maiduguri_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/blog_page_design_template_wordpress.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_b1bf3e6df22444b2889df91c2e5e395e.pdf?index=trueIn PDF document text
    • http://wufaxetotubiji.rf.gd/vegeneluvewosevogu.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/63787488923.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/15442057735.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_acb7b323929449dd8c305a84181bd7e6.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_4a674af81cef4ca9bf40062b7ff21b97.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_60a90a8fb27f4f98a37ee648b0bf4a50.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_79ab25088a5c40889a6cee8933c05d57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/surinukiligerep.pdfIn PDF document text
    • http://nigugolesaxof.rf.gd/corrugated_sheet_suppliers_in_dubai.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_ecaa045f767441329fd4970d6b9a5c21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/vidisoxeminifuk.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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 4856 bytes
SHA-256: f46d8a8f2e2c98181dc49dcf1f8dee193febab102752e3743a9df7120f3b0ccc
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 12344 bytes
SHA-256: 1dda57cbd077e5c498534ada7c6edaa574527b6a9c371d78b1e1ef69ed40f2b4

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