Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc22f58d220d0cc8…

MALICIOUS

PDF

77.5 KB Created: 2021-05-22 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f575e64925ad169bf4cde18c162d8623 SHA-1: f7814cab02c1014fa37df1ee44e3f62bd242701f SHA-256: fc22f58d220d0cc85250fef3c7c80853f18ba2f487ee4ecfcb862adad4a465d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://vilenefex.ru/strik?utm_term=how+to+lead+a+great+interview', is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://vilenefex.ru/strik?utm_term=how+to+lead+a+great+interview PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446273/normal_606c96df7ee67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_600ecbd8e36e3.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/xulelokuvepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_601bd09b2f90e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fd9e91f44255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_6050703a400ab.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/soxedumavuxux_kibegigam_baruwonuxusabo_zikuburagiworaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447631/normal_5fcb6903aa1ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_6069717ab35a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_602ec0b419615.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/wevuju-vubabafagiro.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/7559972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28288566-e0a0-4332-bc24-ae01523c2dab/is_narnia_on_disney_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/84464617615.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/zalonemi.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/tidaripududebifevikad.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/cds_exam_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/dna_and_rna_review_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/22783910407.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/deparajimefamixomade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a725713-dd42-4054-9f11-c0c14af8a665/machine_learning_code_python.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/batumefilapetemowokozul.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/2_digit_subtraction_without_regrouping_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/45680877969.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_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 4928 bytes
SHA-256: f4edbcd05eed7ca560958566d2f4ed92df823ed4ce3f21677104a96146122130
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 11148 bytes
SHA-256: fc2131690ecfd3cf3bfd045b0210efbd8155e3f4ee69b45f1ce40a446c3e9dba

Open this report in the interactive analyzer, or submit your own file for analysis.