Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d0517ebfdcb1b…

MALICIOUS

PDF

68.9 KB Created: 2021-02-26 22:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 559debf821d957759587979bffd84f43 SHA-1: 22887fea5f52483182f733e73af6c7ff6f8ee0ef SHA-256: 675d0517ebfdcb1bb0d8d8df06e6b4b647bfa56f5a96e6568316f10b561d0f5b
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating it hosts numerous external links. One of these links, 'https://baarspo.ru/123?utm_term=what+are+the+australian+teaching+standards', is presented as a search result. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of many external links suggests a malicious intent to redirect users to potentially harmful sites.

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/123?utm_term=what+are+the+australian+teaching+standards PDF link annotation
    • http://wafelizoxekar.iblogger.org/kivisixuwovizidemizoza.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/vebokarujubosiw.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/mizukojoku.pdfIn PDF document text
    • https://nugakiru.weebly.com/uploads/1/3/6/0/136050310/c78b625.pdfIn PDF document text
    • http://mazezoda.22web.org/budgeting_worksheets_printable_free.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/64552385214.pdfIn PDF document text
    • https://rekaxuvukevo.weebly.com/uploads/1/3/4/9/134904446/3242480.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/281e8f.pdfIn PDF document text
    • http://dilijox.22web.org/96078185830.pdfIn PDF document text
    • http://nepifenimet.iblogger.org/b_v_ramana_maths.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefuguwo.epizy.com/55455134961.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/dusozawesigin.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/gitlab_documentation_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/pobivejitexokonufigujakas.pdfIn PDF document text
    • http://xedaripa.epizy.com/91374814056.pdfIn PDF document text
    • http://tuzuvas.rf.gd/6082883044.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/buvezexoribilapujam.pdfIn PDF document text
    • http://fatufad.rf.gd/how_are_leave_days_calculated_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/mendelian_genetics_worksheet.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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 5216 bytes
SHA-256: b06768aa115bc430c4a2a0e0902bca2a9367003546cddfc8430ffd77b8a2219d
font_01_sfnt_off0000e422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 9880 bytes
SHA-256: 451838ca8d9f93bb4c48b6d1139d822e3e88b4ab01459a03e83f3bf9740483c1

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