Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff64fb18be6f12…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 12:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac9a128fc1a77a22be74e3d7171d79f0 SHA-1: b8e897400ac489902844f3a908c54e00cd28b54e SHA-256: 90ff64fb18be6f120d44e4f66a59808cee4e2c199b2f6a07b85b277d691b8b19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=the+mandalorian+season+2+cast+list PDF link annotation
    • http://wowitaly.space/37926367736dz8p2.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/nadesabemabuvakoxi.pdfIn PDF document text
    • http://idealica-ordina.site/855299074732zb60.pdfIn PDF document text
    • http://beststudent.space/breath_of_the_wild_cemu_downloadmjrvg.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/kepujubodolimu_xaronera_vavawoseg_lesit.pdfIn PDF document text
    • http://begdas.space/zisibukogoxetogerilelc91y8.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/vesuvulor.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/sugenarapezipibi.pdfIn PDF document text
    • http://bigtittybella.com/roku_3800x_review3x1ih.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/1461774911.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/gimuvir.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/redhat_ceph_storage.pdfIn PDF document text
    • http://1ux.site/how_to_use_stiebel_eltron_heater1anm9.pdfIn PDF document text
    • http://golden-charm.ru/33214867194qgc1t.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/niwusawikudosugefewavikoo8jbt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jubogaju.atwebpages.com/fivaxozatesaginotawuj.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/1009186475.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/wozevid.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/chemistry_of_life_test_study_guide_answers.pdfIn PDF document text
    • http://kigagizotag.onlinewebshop.net/phylum_arthropods.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/simenewum.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/73137379800.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_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 5260 bytes
SHA-256: caefa8b577640c94f79672e922bf53086138e80fe746917ee0e495e84a006801
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10788 bytes
SHA-256: 4329ebc299f810111976ee93301e40f98b5f1408a6bbf73425e855e0168e26ad

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