Malicious PDF — malware analysis report

Static analysis result for SHA-256 99984c9f39e9b423…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 17:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a6bc6cebcb1eb4f39519664351ade356 SHA-1: 3c14fc47232cffcab1fd7a7fbc0c2de6b597f6bf SHA-256: 99984c9f39e9b423c8a2b1eb9470bf7b1e97817c390d869e3fb3a81ad3d57f31
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which are generated for SEO purposes, indicating a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary malicious URL identified is https://maypoin.ru/wix, which likely serves as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=mole+calculations+worksheet+igcse PDF link annotation
    • http://fesalasan.mygamesonline.org/sample_action_research_proposal_in_education.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/wanifalomazerojovebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusapibu.onlinewebshop.net/simplification_and_approximation_ibps_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/comprehension_passage_for_grade_5_with_answers.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_650815d6db844c0cbadfc937005df07c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/65243273728.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_9b29d4e9c6144885bef98f8a758abb88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/hdfc_ergo_travel_insurance.pdfIn PDF document text
    • http://zedebegeku.myartsonline.com/descargar_plano_metro_barcelona.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/planescape_torment__icewind_dale_enhanced_edition_switch_review.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/51119136346.pdfIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_694d77e3d6054dd7a0e606c5c72cbdca.pdf?index=trueIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_3fde044d4b2f4bab94fcb481b688aef8.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_65fa9c527d9d4e1e9a12d4918c18e20b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/25918534710.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_5af0a22c6ec9466385cf42a15add8f69.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_7e4864fa944642e99bc889a1d994985c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/vogugizuxigufu.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/vovuvobuvagupuwawunireg.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_ec791f1c098042eb988bd654c6475a54.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_f61d604966574e1181f6a4ceeef45197.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_a9c98fd6537f4cf0944828bb5024a5b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/android_mobile_png_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/fire_emblem_three_houses_amiibo_guide.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_d15198ec0db54578b9c496fd20270075.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_6af6708c0e50499cbd378a7c869c4fed.pdf?index=trueIn 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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5220 bytes
SHA-256: 8494cbc1cd1c89007ba5d83119f8738edcbb0405e14e21d4f71964c64a694f54
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11768 bytes
SHA-256: 78b616db54759ee5b24998d930b16b38c8290bc01ba41f88777ef318463141e2