Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dced2b21ae7f133…

MALICIOUS

PDF

70.6 KB Created: 2021-02-22 19:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b003f399bb077ecf50b31dce96abefa3 SHA-1: 8193e8843e4746b14ff8b1def56081a496324eaf SHA-256: 8dced2b21ae7f1331259aa20743647b9ccddc831b1c9e47419f2797ed0163679
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are disguised as book downloads, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=life+science+pdf+book+grade+11 PDF link annotation
    • https://cdn.sqhk.co/vilubofi/ihtcgNR/pac_man_world_2_gba_rom_download.pdfIn PDF document text
    • http://hookup154.space/dajexublbihj.pdfIn PDF document text
    • http://trastenmyqort.online/multiplication_and_division_of_rational_algebraic_expressions_worksheetswmihd.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jhaggkv/remove._bg_remove_backgrounds_100_automatically.pdfIn PDF document text
    • http://idealica-official-it.website/18371496754wzk84.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/3dd03.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/b9QDibC/juvufupotovakajigevav.pdfIn PDF document text
    • https://mavuzoxawajike.weebly.com/uploads/1/3/0/9/130969593/1488355.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/binofivosumej.pdfIn PDF document text
    • http://persequen.com/best_self_tan_2021ra02x.pdfIn PDF document text
    • http://chambre.xyz/kilisegenepogolatamazisumbeko8.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/sivanira/69510646921.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/indeed_cognitive_ability_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/android_pie_black_and_white_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/37271712466.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/6th_grade_go_math_book_answers.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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 5488 bytes
SHA-256: d6a069b5e33582712e27850ede7bf778754b97c8936f78122fe5bd112e6b35a2
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 10088 bytes
SHA-256: 0369074c956e939610760c1a487be7f7477d66f6d73a390f7b05feaa16aa24d8

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