Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1d6a40d66e17d1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-12 11:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fe6a50a76b2259e06515b647a5ebdb4 SHA-1: be4eb31727d9883c561398d091d00a864cb84497 SHA-256: bf1d6a40d66e17d1f9ed8df7aa7317905146f37b1039e62a9ac6daf3c68e60d7
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The embedded URL points to a site that appears to be a phishing lure, disguised as an educational worksheet, which aligns with the overall malicious classification.

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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pelibifir.ru/wix?keyword=was+and+were+worksheet+for+grade+1
    • https://cdn.sqhk.co/nuroteditu/ghGhhED/48098458378.pdf
    • https://cdn.sqhk.co/bubuzibiv/DCZggoc/free_gems_brawl_stars_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4499656/normal_602b4ac298366.pdf
    • https://cdn-cms.f-static.net/uploads/4450353/normal_603d039a4a51a.pdf
    • http://apelsins.space/42905470859r3u5m.pdf
    • http://5coupons.info/how_much_does_it_cost_to_repair_a_refrigerator_ice_makerqfk4w.pdf
    • http://baby-slings.ru/class_12th_sociology_notesoyekr.pdf
    • https://cdn.sqhk.co/xivovido/bifjcpq/block_strike_hack_2020_download.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_600a7a76e19bb.pdf
    • http://tadosuzewamu.medianewsonline.com/can_you_whitewash_with_chalk_paint.pdf
    • https://cdn.sqhk.co/dopiporajen/c3KBkjf/duwetamejalelipu.pdf
    • http://cosmosqrab.online/how_long_to_cook_a_pork_roast_in_a_pressure_cookerj0o0d.pdf
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ffa017bb0dc8.pdf
    • http://fovikoxesaweziz.medianewsonline.com/blue_book_of_grammar_free.pdf
    • https://cdn-cms.f-static.net/uploads/4503387/normal_600ca14bdbdba.pdf
    • https://static.s123-cdn-static.com/uploads/4372073/normal_5ff78ab99f7f8.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6019118bb55f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wudazebej.atwebpages.com/how_to_increase_pressure_on_breville_espresso.pdf
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a2a242566f5b4acc9d84451757f5ea54.pdf?index=true
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_1ec61dda3a084cce9fb21db5353cbf54.pdf?index=true
    • http://vimixof.onlinewebshop.net/mipunudajiropusorawiwuba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1b.bin
08fbeb66c638979f0478aa33892c43950b4c6191a8674c295fde7bb04d353e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 5360 bytes
font_01_sfnt_off0000fe72.bin
0e0ed20a92989528bbc3d1ee1ef8b0d648f5146fd08009bd565409daaa380138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 10440 bytes

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