Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e36701c8a692fa…

MALICIOUS

PDF

76.4 KB Created: 2021-03-29 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2e48e51d24de919343ac5d78716501 SHA-1: 5990b88a7d9d99a71ac2e17e370c55e5cb63de23 SHA-256: a8e36701c8a692fa1cee8a422322e513b4c7cd769f31345e943c1bf6dc482d20
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of external links, indicating a potential link farm or redirection scheme. While no scripts were extracted, the presence of numerous URLs suggests an attempt to direct users to potentially harmful content or phishing sites. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link-heavy nature of the sample.

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://druttle.ru/123?utm_term=a+practice+run+before+performance
    • https://cdn-cms.f-static.net/uploads/4388620/normal_600f7fd15cc69.pdf
    • https://cdn-cms.f-static.net/uploads/4460071/normal_5fd894404274d.pdf
    • https://cdn-cms.f-static.net/uploads/4368772/normal_6049a8cc1acce.pdf
    • http://nulivanofika.mygamesonline.org/nelowexazazum.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6022c48b0847e.pdf
    • http://bitjoms.xyz/kuwavakajamilafinafikopatmkwyy.pdf
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6035d2d59ee82.pdf
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5fc6ca2b9e1c4.pdf
    • http://form-copyrightservices.com/the_pledge_of_allegiance_in_spanish7ach0.pdf
    • http://goldotzyv.ru/gre_math_prep_book_free0gbow.pdf
    • http://instapriz365.site/barron27s_ielts_superpack_2018oq2hz.pdf
    • http://nextauto02.ru/school_emergency_information_card_templateotyy8.pdf
    • http://italy50wow.pro/welezisofakerebunigozagidze2zu.pdf
    • http://dalkomis.website/legends_survival_battleground_apkpure2xufd.pdf
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6058461c668e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_0415f4fe45d246c6bf912f96f2e68840.pdf?index=true
    • http://nukivamo.myartsonline.com/what_the_bible_says_about_time_of_death.pdf
    • http://pesetunal.onlinewebshop.net/article_on_child_labour.pdf
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_13a520bdd6334bfc8c8431fa83098a2c.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_off0000eeb6.bin
a62709cab887c65a17f45f54cc08d16737a834f062420aadfee6f2491d7aa1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5080 bytes
font_01_sfnt_off0000ffe7.bin
5dbcf086472e9b08fa3203c19486fb2764ad8812e242da3a30461c74ceb15213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10640 bytes

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