Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3b4a59d29d3017…

MALICIOUS

PDF

78.3 KB Created: 2021-02-15 11:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 97c1eb7f4c16bcc68989e1cf4f7cc336 SHA-1: cbcb90f10a387904c326e54519d2548fcf4c716c SHA-256: ea3b4a59d29d3017030b3a243db4f540236e6855e4c855057d8eae3632915206
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and other hosting services, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, and the 'ML_NYX_PDF_MALICIOUS' score is very high. The embedded URL 'https://baarspo.ru/wix?keyword=boston+tea+party+comprehension+worksheet' appears to be a lure, likely leading to a malicious site or further payload. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/wix?keyword=boston+tea+party+comprehension+worksheet PDF link annotation
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/0d185d5.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/sivekisobogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_60264de32cca4.pdfIn PDF document text
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/7922916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fdb8b758e786.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_60188740cccc3.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/gipapalofadarabifoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601483b03b684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5fe35253e19a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5fee0fd645ee2.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/movuvoramivoze.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/xusosovufakawujofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zamemigojat/10474211841.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/nebuxovujavidafi.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/19542524793.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/bearing_designation_skf.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/2007_toyota_avalon_service_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5236 bytes
SHA-256: eaab4b40ad41dd2e7f6c536c443b33131292c0a257c73d51147ffee1461187eb
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 10616 bytes
SHA-256: 79b5553e840cb8c0f6ca50661c006219ce8444a125a2b31098d440c8b2079e9d
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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