Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb794d58c10e4b29…

MALICIOUS

PDF

84.5 KB Created: 2021-03-01 08:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6d1de12f6ec5f5c1e8254ff0ab494114 SHA-1: 0e1ce5916a0e70f5e0a20af929c97f2d124c6695 SHA-256: eb794d58c10e4b2989139caab3446da8e97d3cd34287191b48efbbecade9990b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URL 'https://crophysi.ru/strik?utm_term=water+wheel+horsepower+calculator' is suspicious and likely leads to a phishing page or malware download. The document body, though heavily obfuscated, contains references to 'Water wheel horsepower calculator' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=water+wheel+horsepower+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371790/normal_601f0dac974b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/aTfhijc/mountain_lion_run_cycle.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/how_to_dye_yarn_multiple_colors.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/3083507288.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/gcCOLib/33571125350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_60152fdc636c1.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/jihchiv/18190661233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_603a623c0d39a.pdfIn PDF document text
    • http://majikok.mygamesonline.org/best_books_for_8_year_olds_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_6026183ab8041.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/Ykicpig/xiguxopugoram.pdfIn PDF document text
    • https://cdn.sqhk.co/vipotukivisi/huWF3he/lekorita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/backup_software_for_android_to_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/birokeweru.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/aladdin_cartoon_song.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/chapter_15_work_and_power_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/can_apple_facetime_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/bharathidasan_university_pg_convocation_application_form.pdfIn PDF document text
    • http://tiredosutozol.atwebpages.com/new_john_deere_4045t_engine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/afro_sound_songs.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/corsair_k95_rgb_platinum_xt_mechanical.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_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 4852 bytes
SHA-256: 395b5e8b29460dbef00152ae15285582af10823671c834e34addc18ce7de9103
font_01_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 11220 bytes
SHA-256: 1f7099870114a44acea0d4050c85ae0a7dd7d29272c1c2531c89849a9e848abd
font_02_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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