Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfad54ca107a4c1…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 01:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf8ccd03f35a1292c14c1db1c66ab2a7 SHA-1: 536781bd03a284861ee49c60639b93f9fa690f6e SHA-256: dcfad54ca107a4c1b14cda58e71aec6f4f7570ace8379d7f85cba70c50164641
156 Risk Score

Malware Insights

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

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 0.9998

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://jottigo.ru/123?utm_term=what+books+are+coming+out+in+2020 PDF link annotation
    • http://xawegap.mywebcommunity.org/que_es_la_linea_de_alba_en_el_embarazo.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/bujigedatezimi-gefogolukuz.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/what_is_the_average_income_of_a_household.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/10124764fb.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/bfe44d0.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/jozakelo-lafebibejanip.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/7hbUqjb/44831419119.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/social_implications_of_climate_change_in_southern_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/gd8jagu/economics_jobs_near_me_entry_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/gepidexujosapujotugazag.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/diy_hydroponics_systems_builder_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/espghan_guidelines_parenteral_nutrition_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/rugovebotilokokisasu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/microsoft_project_pro_2019_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/xujirefanipalonap.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/33546144246.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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5672 bytes
SHA-256: d20b947a23eb8888fba4103641b9ca9691bde97839d421e2774d8fdb88a11eaf
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 11504 bytes
SHA-256: a19611dee04d7ba81e8576db26ae71e4078824c7b939e7e725bb42e728661f55

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