Malicious PDF — malware analysis report

Static analysis result for SHA-256 536ea337f0d0f050…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 00:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4957e73b3c27db713d6a2c39cddefc08 SHA-1: 5feceeaabfc595885159efe8a062a92b8c59dab3 SHA-256: 536ea337f0d0f050efa9e100f46be8b166e9db90d317087164bbdf1e37b24771
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=fundamentos+de+bacteriologia+pdf PDF link annotation
    • http://dapujabowigu.sportsontheweb.net/the_chosen_jr_ward.pdfIn PDF document text
    • http://rivorumijarugen.22web.org/is_the_stock_market_open_on_friday_july_3rd.pdfIn PDF document text
    • http://gagapazu.scienceontheweb.net/amoxicilina_clavulanato_bula.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/duzevoxelimeragu.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/43503529758.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/zodumuxuvevugoral.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vodividubo.rf.gd/animal_cell_and_plant_cell_difference.pdfIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_4ef9eedd007e4c9a9222e211cae92cb8.pdf?index=trueIn PDF document text
    • http://nogomazarem.epizy.com/12270473910.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/silk_bed_sheets_meaning.pdfIn PDF document text
    • http://kujodobiwug.rf.gd/docker_books_free.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/aditya_hridaya_stotra_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/sputnik_sweetheart_english.pdfIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_4ac0dced083249f98241db5bcbe8b7ed.pdf?index=trueIn PDF document text
    • http://rimivumukox.epizy.com/58306768972.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/casio_fx_82es_plus_manual_english.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/fuxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/modegibevoranomotiradan.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/78882252104.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/canon_rebel_t5i_lens_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/6346234183.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/real_madrid_bed_sheets_india.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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 5568 bytes
SHA-256: 8d7e2d21824b1b8d83526ca8f3079e1b0bf9c45e2f958baf4c7955f873841565
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 12944 bytes
SHA-256: 2d91a5bdb43d495487b011403cbfd908725091ca4af1b3b29ae37df3e4088e1b

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