Malicious PDF — malware analysis report

Static analysis result for SHA-256 b776795a026f53df…

MALICIOUS

PDF

79.0 KB Created: 2021-04-17 08:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 482349414150a6ec86c2f9db48f7fde5 SHA-1: 61f61adff83db19eafbc405e2f6a58cbbbffa494 SHA-256: b776795a026f53df0465447a15fdc430e5a16a4713df5108cbe3222e2d03ec52
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, identified as a link farm designed to redirect users to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lead the user to a compromised site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=how+to+change+the+name+on+esi+phone In PDF document text
    • https://bowetupivivuz.weebly.com/uploads/1/3/1/4/131437724/judafufoxog.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/badadi.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/baroque_music_characteristics.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/salenubaxosarasawa.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/xedabakijoxuvajolavawida.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/east_africa_history.pdfIn PDF document text
    • http://janusadow.mygamesonline.org/music_and_tourism_on_the_road_again.pdfIn PDF document text
    • http://wativeb.mypressonline.com/certificado_medico_escolar_formato.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/different_types_of_hand_embroidery_stitches.pdfIn PDF document text
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/wazubu-wefawifafote.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/reading_actual_test_vol_5.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/7989216.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/bsc_mathematics_honours_syllabus.pdfIn PDF document text
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/7759087.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/2580382.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/91350774491.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/tewidototezofulafuzolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rifilax.epizy.com/cambridge_pet_book_8.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/jazebajasagiwofawo.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/nermeler_ve_bileik_nermeler_9._snf_test.pdfIn PDF document text
    • http://vofiwevo.epizy.com/grievous_bodily_harm_with_intent_sentencing_guidelines.pdfIn PDF document text
    • http://pixafur.atwebpages.com/70972484775.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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 5272 bytes
SHA-256: 857c9727d2eda63ef360a3fd1d228eb664c4f5733aa9b4c0c9d3c4fb664a840e
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 11300 bytes
SHA-256: 758b5417024e289d7ca899ebca1c1c7225173f56edc611676b130d710c687d1c

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