Malicious PDF — malware analysis report

Static analysis result for SHA-256 18795a80b07e2ec4…

MALICIOUS

PDF

84.7 KB Created: 2021-04-30 04:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d9e76b9d0c43866badd1f31e9beff5d9 SHA-1: afba126e88c0ffd793f4a1c1f1933bb21f6f5ae6 SHA-256: 18795a80b07e2ec49f86bb2f72cd574c89e31c051433790e14116396cb51b223
104 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is associated with a phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text related to invoices and QuickBooks, reinforcing the phishing pretext. No scripts were extracted, but the presence of external links suggests a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/strik?utm_term=how+to+record+accruals+in+quickbooks PDF link annotation
    • http://crispyset.online/how_to_control_your_apple_tv_with_your_phonezfnur.pdfIn PDF document text
    • http://autocredit.moscow/what_exercise_can_i_do_instead_of_jumping_jacksbz6ba.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/10140510658ro5m1.pdfIn PDF document text
    • http://lijazojomuzawo.22web.org/55327236435.pdfIn PDF document text
    • http://xozonline.ru/98296386994domiv.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/2054100.pdfIn PDF document text
    • http://twoup-viktoria.online/koxusajudodmnxn.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/811ad.pdfIn PDF document text
    • http://bunnygummy.ru/10055039107yqdc2.pdfIn PDF document text
    • http://niwifara.22web.org/vsco_presets_lightroom.pdfIn PDF document text
    • https://vabusidi.weebly.com/uploads/1/3/4/7/134765039/nabarijojid.pdfIn PDF document text
    • https://selemuja.weebly.com/uploads/1/3/4/8/134893326/petesusepotajesaz.pdfIn PDF document text
    • https://vimujagu.weebly.com/uploads/1/3/4/3/134306096/debenusitajo-sojazimunako.pdfIn PDF document text
    • http://auth02mobility.com/contabilidad_de_costos_para_que_nos_sirve5vebe.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/pujirageg/8095861939.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/free_bookkeeping_books.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/reflection_mulan_piano_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/celtx_vs_final_draft.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/gi_bleed_guidelines_2019.pdfIn PDF document text
    • http://sanozibexado.epizy.com/school_admission_form_template.pdfIn PDF document text
    • http://fugovolit.rf.gd/12993737936.pdfIn PDF document text
    • http://xolelapideruse.epizy.com/mikorubel.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_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 5196 bytes
SHA-256: 31b82727ffd3c5e812c9d0d9544ea6d6cc9f4120352cd4dd6cf76d83059cbd55
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 10876 bytes
SHA-256: dceba16d8c326900e568cdee2b1ae9cedd624fa8efc2bacc8ad93d29e2ce8ed8
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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