Malicious PDF — malware analysis report

Static analysis result for SHA-256 8153540b64654c86…

MALICIOUS

PDF

83.3 KB Created: 2021-04-29 17:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8721fc5c2d88acc15a0cf5a21e975ca SHA-1: 5c3ce2b949776cbdef55b32da65e7556d877e213 SHA-256: 8153540b64654c86566af33b39e4974376f794e5c69c22c8806d6f327e72fd18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=tone+it+up+protein+powder+pregnancy
    • http://aydym.club/why_text_is_important_in_multimedia4889x.pdf
    • http://teren.fun/butosinolitebhrpvu.pdf
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/gizena.pdf
    • https://pokiwaminexaga.weebly.com/uploads/1/3/1/6/131637240/99d75c687df1a.pdf
    • http://xafopawiki.medianewsonline.com/how_to_adjust_stride_length_on_elliptical.pdf
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/rixevofasepof.pdf
    • http://vamolufu.getenjoyment.net/44547690459.pdf
    • http://vinnipoh.fun/what_does_the_bible_say_about_mothers_working7ovcm.pdf
    • https://wigotimobegevuj.weebly.com/uploads/1/3/4/3/134312632/255babfa1.pdf
    • http://nonoxutiwi.mypressonline.com/psychology_disorders.pdf
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/6ae83dd4a289309.pdf
    • http://hookup673.site/emergency_medicine_salary_by_statecr7mq.pdf
    • http://zoomita.space/86699804804nh4u3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_9d94b28e167a46fab063aeeeb88e74f3.pdf?index=true
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_254062813c79482b8138aa0d307d07f9.pdf?index=true
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_273edafc2d424b6297839485cfadb8d7.pdf?index=true
    • https://s3.amazonaws.com/kovibu/vermiform_appendix_appendicitis_histology.pdf
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_f9b3bbf57c0b406f9db90438e4536b70.pdf?index=true
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_9a3277cf09d641759d506aafe93a413b.pdf?index=true
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_967a79d5eeda4281be6b82fefc4c2b05.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_fdae04956fc74cb781c7278ee249893c.pdf?index=true
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_1d4041e10a9d4bb2904acc880891fa6e.pdf?index=true
    • https://s3.amazonaws.com/robumuduluwise/gemorumuriposeze.pdf
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_bb24ed4af6d34e819d5aabd6445e2346.pdf?index=true
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_aa1b13bd296d449d85cf79d91f406773.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_off000109ec.bin
3ff1632768bec9682c0036437a5a003a9e4270a6188acc90f6080f9e5b6db894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5176 bytes
font_01_sfnt_off00011bb0.bin
fe7c430087f027272626bb439c4bc2d4d4f5175b498c5909004bf9a8c4ea650e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 10496 bytes

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