Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6c0dd9da9d7c3f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-02 10:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ab2405e74d278e541e04ab40d6a25923 SHA-1: 2da852131005d632e42711d99fd07e0cb1d5667f SHA-256: dd6c0dd9da9d7c3f2d25f961f7f565c6afd6e620a818596b70d2ba32a9de9736
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, particularly the one pointing to 'pelibifir.ru', suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

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://pelibifir.ru/123?utm_term=uc+browser++java+nokia+301 PDF link annotation
    • http://imedo.ru/jawbone_up_pricetlyab.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/1190e8597b18e3.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/0c26bc4.pdfIn PDF document text
    • http://nufugexasodud.iblogger.org/44838791630.pdfIn PDF document text
    • https://puviguwa.weebly.com/uploads/1/3/0/7/130776677/4143078.pdfIn PDF document text
    • https://xesejiru.weebly.com/uploads/1/3/4/7/134716288/dutize.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/407ba27e5.pdfIn PDF document text
    • http://lusoxokurutugap.22web.org/good_morning_photos_hd_gif.pdfIn PDF document text
    • http://1offpark.xyz/ashraful_hidaya_part_240dop.pdfIn PDF document text
    • http://korecos.ru/samsung_refrigerator_rf263beaesr_manualqqh4f.pdfIn PDF document text
    • http://ecosbor.net/jakotitixs9sd.pdfIn PDF document text
    • http://thiswaytovogue.com/1303690404303kjn.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/sajezife/whats_economic_imperialism.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/complementary_angles_and_supplementary_angles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/ragemogozeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab7acba-e974-4c86-a9d2-dec643430fd0/walokotofopidugovuzomeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3480ebf3-f94d-4605-bb6a-a8f559fee701/lawanegufosilubagoziso.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/nurevupezujegugebofined.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/excel_vba_cell_reference_another_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/necrotizing_ulcerative_gingivitis_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/does_bounce_dryer_sheets_repel_mosquitoes.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/xumopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b48a19-ef56-48f5-a3d6-834a7ff1a328/west_hartford_public_schools_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/hernia_inguinal_incarcerada_pediatria.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_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5544 bytes
SHA-256: 2b3c49f174b0d03bfc25e34d5340ae014ad40140fd0ec1e4556d1e3fb9c19272
font_01_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 14912 bytes
SHA-256: ebd739087118adc75aabab4ef96757675ddefb2588a2c41950ede7040523663f

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