Malicious PDF — malware analysis report

Static analysis result for SHA-256 1143e9a49aaa3bb0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 02:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 102a36309be2a0835961477ac1e0eaed SHA-1: 2575c65128636e355cc77d02871fa9185ccc61cf SHA-256: 1143e9a49aaa3bb01d06dad29b3f19036238e10d9fea7cc483d6a976e1849c9c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging an embedded URI. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://jacksth.ru/strik?utm_term=how+to+empty+cuisinart+ss+700 PDF link annotation
    • http://carinsusa.com/a_first_course_in_numerical_methodsbtmc1.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/Jji0f2N/jewijetonujisatoro.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/fibgclp/how_to_use_infusible_ink_sheets.pdfIn PDF document text
    • http://kersita.fun/traductor_google_ingls_espaol_en_fotoobg0z.pdfIn PDF document text
    • http://prodive.su/41969729433m6ko3.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/jobidupe.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/WQhbjhj/dusttale_sans_theme_roblox.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_install_foxit_reader_printer.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/16531884313.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/business_secrets_from_the_bible_book_summary.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/xukinodipe_xomosuvu_mavokokijamewi.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/vesigawivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesetunal.onlinewebshop.net/28769814041.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/90171789004.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/boxetulatuxolifegiveki.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/encyclopedia_of_world_history_volume_4.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/lesco_spreader_parts_breakdown.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_3c4a111ad58240ee904ba76b79193e9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/39332739201.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_1b82e24011d54a2c859bb19db56946d1.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_16b0f4bc0eda45a5af8158310539080c.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_dde8ba5b243c4071bae1cd3dc19410e7.pdf?index=trueIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_3de87f36800b4f53b1d53074fd8c6651.pdf?index=trueIn 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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5424 bytes
SHA-256: 278d0439f3dc54c370ab9ee3a20ed4ce048d4aef64f31d006a9afe848deba940
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11392 bytes
SHA-256: a85c24c1fd30bef42c2e2c7eafff05f879aec46b95a53e81c92463fd4e5d30fa

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