Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89b196b767ba487…

MALICIOUS

PDF

81.4 KB Created: 2021-04-19 06:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb360588d52685d7762f4d5d823972b1 SHA-1: adb141ea6f97ede91fe96f3fc8635ddd2f01b247 SHA-256: d89b196b767ba48717a2475700f1514e385bce75456253a98581390263e715ff
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to downloading Windows 7 ISO images. The presence of numerous external URLs, including one flagged as potentially malicious, indicates an attempt to redirect the user to external resources.

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://bologen.ru/strik?utm_term=como+descargar+imagen+iso+de+windows+7+ultimate+32+bits
    • http://loxupuf.mygamesonline.org/cm_to_mm_conversion_chart.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_6011a6e32aca8.pdf
    • http://storeyou.store/703650599817z181.pdf
    • http://everydays.space/chemical_principles_7th_edition1ib6w.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_5fd1c6ef23a9e.pdf
    • https://fufosasoxesa.weebly.com/uploads/1/3/2/7/132740234/6860638.pdf
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/javusutibi_gimus.pdf
    • https://cdn-cms.f-static.net/uploads/4384046/normal_6042cf5328440.pdf
    • https://cdn-cms.f-static.net/uploads/4373986/normal_602f3f8ee5d82.pdf
    • https://cdn-cms.f-static.net/uploads/4410432/normal_60601b7ed2c14.pdf
    • http://girlita.space/online_teaching_job_interview_questions_and_answers3vsbf.pdf
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fef47cc48185.pdf
    • https://cdn-cms.f-static.net/uploads/4407087/normal_6043580049689.pdf
    • https://cdn-cms.f-static.net/uploads/4495988/normal_603e5ff6c5b89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_0d93761b2af54743b8d8596be09f586f.pdf?index=true
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdf
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_a8b253cd3b524ff3a2ebc4313fd61bd5.pdf?index=true
    • http://givetupazowo.onlinewebshop.net/69781852202.pdf
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_14199619c6794cae9e3dd823a16c9b41.pdf?index=true
    • 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_off0000fb63.bin
f77b3cafab0ee54ab4753ad0b747f3128aeeb25c2ec4870538ff050f8e0188ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 5772 bytes
font_01_sfnt_off00010f04.bin
4d5ec72efa2e1a47cac7ed744fa1e1f31e5012ed75a1b530e5b9e7c9a0d9352a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 12096 bytes

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