Malicious PDF — malware analysis report

Static analysis result for SHA-256 396e00b650c4ce9f…

MALICIOUS

PDF

178.6 KB Created: 2021-03-03 05:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c8ff547e4e2067006c0e1a9de33ab6b1 SHA-1: 79ac6003822efef7990a964157e2d21ba19d5ee1 SHA-256: 396e00b650c4ce9f18a5a25d7ee46a5d01de2061a354aae20e750453a7db4c29
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'jacksth.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://jacksth.ru/strik?utm_term=best+line+6+pod PDF link annotation
    • https://jasofemelufes.weebly.com/uploads/1/3/0/7/130740231/xorizexiwutonotu.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/gcyhfFn/nedegokimupegemirilik.pdfIn PDF document text
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/4804b0ea9d.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/gonegizerevi.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/gRgjfkN/kunci_jawaban_game_brain_out_level_32.pdfIn PDF document text
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/didizezazawevij-fovapuvenidila-vifekoliwezur.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/65933418404.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/rurosaveruk/vejifisamoge.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/caibx_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/81380160094.pdfIn PDF document text
    • http://xeravujowa.epizy.com/wumigonunowufuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/dg_vaishnav_college_arumbakkam_chennai_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/brasero_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/corporate_upbeat_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/transformers_prime_arcee_dies.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/muberagofe.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/dungeon_master_s_guide_5e_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000273e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273E8 3060 bytes
SHA-256: aa3d185fea86bf892548485398070c3a46c62a315b407498f3212bdeb44606ca
font_01_sfnt_off00027ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27ECE 4848 bytes
SHA-256: 7d4c8ef1dc2e82e48964898be4935bc007ec4b29b82da6ee1dc24ac72a304e04
font_02_sfnt_off00028f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F63 14064 bytes
SHA-256: dfbce4fc04254997ca7b8da35621cbc44ffd2fd05f98e94e7da769add98f5e4a

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