Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f4d92eb080ab0a…

MALICIOUS

PDF

75.4 KB Created: 2021-03-22 12:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 653d34c3437092f59f9be1d1979841fa SHA-1: 95132a783488eb23094971d35b67652ee5a8050c SHA-256: 53f4d92eb080ab0a1f04637d3cf5183834e2770c132099a78260a602a6cfb645
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 0.9997

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://nipisod.ru/strik?utm_term=how+to+clean+a+vicks+germ+free+humidifier PDF link annotation
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/mabekopabovamozotar.pdfIn PDF document text
    • https://numetigovav.weebly.com/uploads/1/3/1/6/131606493/b70c0b2348.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/feboxemudorofegas.pdfIn PDF document text
    • http://jijukilodo.iblogger.org/sample_id_card_template_green.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/sixosemizo_mifubonadamero_zarefenofe_girasovilaxemu.pdfIn PDF document text
    • http://lavisil.22web.org/segajopabenidivememe.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/2406725.pdfIn PDF document text
    • http://muvariwiporiju.iblogger.org/uitzending_bijwonen_formule_1_cafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujotoginejo.rf.gd/xidezoganabuteleles.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/36264471042.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/brush_lettering_practice_sheet.pdfIn PDF document text
    • http://molodetagako.epizy.com/fish_eating_bird_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/61224948433.pdfIn PDF document text
    • http://losisotudek.epizy.com/chidinma_yanga_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/how_to_make_a_custom_website_from_scratch_using_wordpress.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/melde_s_experiment_viva_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/jojelalusikepanupukatowuk.pdfIn PDF document text
    • http://datadeb.epizy.com/ifpi_digital_music_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/60146848468.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/zisiwirivabejilagiret.pdfIn PDF document text
    • http://bebokele.rf.gd/the_birds_work_for_the_bourgeoisie_copypasta.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 5612 bytes
SHA-256: 4106420bac79ff018f63a95f526517dc455562ccdc82a962e4456c0231dadd3d
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 10404 bytes
SHA-256: 0a7996a78974eeb6a4ce54aee7881a2da40e9541cb2a4d1acd3b49be5e311e5c

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