Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caf61f1f21b62f4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-14 13:12:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4daa68aa35a859a708d7effeebde6d9a SHA-1: e826da594480213d8d51c2cec8981ec6d1b87ac5 SHA-256: 4caf61f1f21b62f4c64f9f1d3aba04be98cf70c0865706bd228b9d662cd07bf5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to phish or deliver malware. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/award?keyword=black+s+law+dictionary+pdf+2020 In PDF document text
    • http://arevakar-travel.com/vagagifodovojmjb1f.pdfIn PDF document text
    • http://whalesqpa.fun/topdog_underdog_play_scriptlpbs8.pdfIn PDF document text
    • http://lp-consalt.ru/3143988394ubd2x.pdfIn PDF document text
    • http://com-servers.online/27459538483c7vaa.pdfIn PDF document text
    • http://sallely.xyz/25928908710syqal.pdfIn PDF document text
    • http://igonlinesupport.com/majasetowenikowuxixupzsi.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/vanatul/susan_cain_quiet_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/funeral_march_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d7b088-31a1-4f29-ac65-b2f879e7f139/71767685636.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/diploma_template_png.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/desowebosaresurug.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/nikodifojudorar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c65218-f2a6-4ae9-8308-73a99a25a807/craftsman_laser_trac_drill_press.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/spanish_fandango_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/lizepinofilenimavilul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5e5dae-6609-4673-b83c-580b5e237edf/como_rechazar_una_oferta_de_trabajo_amablemente_ejemplos.pdfIn PDF document text
    • http://godolefimew.epizy.com/badshah_movie_mp4_hd.pdfIn PDF document text
    • http://zuwasezubolek.rf.gd/58724472906.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/organisation_structure_template_ppt.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_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5728 bytes
SHA-256: 5c047da877e1b71a5eb2237808b8a410b943480b51dd29f9712e4764a179fa2d
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10316 bytes
SHA-256: c9689ee9202fd766206d0e1947d5d47ce672c624d7b6df3369c5532a43404949

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