Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d618f69506e950…

MALICIOUS

PDF

83.9 KB Created: 2021-05-18 05:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 123ee5e60349bae47481d68cc93109cf SHA-1: 2c62326692152ecf988232584c024bfaf92bac32 SHA-256: b0d618f69506e9501d26025e6f2f5d323ba63155759bd2c26cd2abc8c8f592c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs.

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
  • 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://resalured.ru/strik?utm_term=new+cv+format+2019+bd PDF link annotation
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/9351222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5fd3b8b25aa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_606a8846be457.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/jusezilivufovir_lazil_tarowebifudavo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5ff96bb25e098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6067da82aa92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6027c0cf426a3.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/dosalapasenow/cisco_wireless_access_point_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/bikekusejujovarafepe.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/pizanoruxaketokizulixa.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/quick_installation_guide_oracle_11g_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/install_android_apps_on_windows_phone_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/12568638735.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/petsafe_automatic_feeder_directions.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/troy_bilt_storm_2410_electric_starter_cord.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/best_free_soccer_game_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642094b9-1124-49f4-8e49-08982cff1f4e/how_to_make_yahtzee_score_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/neripigawanikowukenume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536fd62a-49e5-45a3-bbc1-f4aee8b151a1/escuelas_contemporaneas_de_la_psicologia.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/zazuvufubiwitununeza.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/afmc_entrance_exam_model_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/irganox_1330_technical_data_sheet.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_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 5700 bytes
SHA-256: 58d8face1fdba78541f3b0bf126bcc933ba4ff2b658addf66b6e1c384c42b716
font_01_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 11444 bytes
SHA-256: 4fe49d29ab137eef491399bbf4c368c40b8b62a74a3d1425516de5d619a168d0

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