Malicious PDF — malware analysis report

Static analysis result for SHA-256 10407c33e4d673d9…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 21:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7eb4370e891d04c85fdceb9d3fcfdaec SHA-1: 96ef7c9249e70bfe9aa3da70f19927348ed0cbaf SHA-256: 10407c33e4d673d9051091865c6a22151546f371b0396dc6e37577512c0ebbfc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=what+does+shadow+symbolize PDF link annotation
    • http://goxalajiwon.22web.org/gikafapagepabuxokus.pdfIn PDF document text
    • http://zufabud.22web.org/37364891317.pdfIn PDF document text
    • http://ketorebagibof.22web.org/private_facebook_videos_mac.pdfIn PDF document text
    • http://jagojurezowu.22web.org/drive_through_history_worksheets.pdfIn PDF document text
    • http://fivogudog.iblogger.org/blank_w_9_form_texas_2019.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/9029544.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/tajakogoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasufogokalo.rf.gd/fix_you_piano_sheet_music_easy.pdfIn PDF document text
    • http://nuridoxiwe.rf.gd/aspirina_en_el_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/acid_rain_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/25068050117.pdfIn PDF document text
    • http://japixunatavaxi.rf.gd/statistical_methods_for_social_sciences.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/migraine_treatment_guidelines_australia.pdfIn PDF document text
    • http://semodozafilisu.rf.gd/51653814534.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/65243273728.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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 5368 bytes
SHA-256: fa611238e38d9540915b42980ea05fb47fdf55155f061d9acfeddf996357f333
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10828 bytes
SHA-256: 748c35a25fd75ee004e258360e8a439acc373763e5cdc2cce2279f89502697b9

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