Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dd7329c43540a0…

MALICIOUS

PDF

67.9 KB Created: 2021-03-16 06:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3b92f77bd4ef7841cd343093977bc09b SHA-1: 9dbdd075025d495a7482d94712c913eafcd0c335 SHA-256: 13dd7329c43540a0d4024eb8e4351b3df01448e1455529f820aaa6c7e59a4746
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URL and the document body suggest a lure related to free literature PDFs, which is likely a pretext to direct users to malicious sites or download further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=backpack+literature+5th+edition+pdf+free PDF link annotation
    • http://umkatrade.ru/wugigevufukwhj2.pdfIn PDF document text
    • http://smartcoin.design/17487665509ynb7i.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/ggghfQo/wordscapes_level_8268.pdfIn PDF document text
    • http://tublitalia.space/husky_pressure_washer_2600_psi_partserfco.pdfIn PDF document text
    • http://airbin.top/popstar_never_stop_never_stopping_gay_songrkm6i.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/jbgchgT/ruzomob.pdfIn PDF document text
    • http://secret-empire.ru/how_to_combine_like_terms_with_different_exponentsrg9q0.pdfIn PDF document text
    • http://reweder.site/how_to_fill_out_employee_direct_deposit_formxj929.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/pijhhje/accounting_tools_for_performance_evaluation.pdfIn PDF document text
    • http://copyrightnotices-form.com/92299807473ztyh7.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/gezetega/air_force_one_love_letter_resell.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_d55ac120028d41b2b0312b641c8665f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/jesus_loves_me_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/the_fossil_record_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762f7ee3-7d9a-4d42-99cf-3ba6a861be23/sangean_wr-22_remote_control.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d899d4b80bee40daaee41db08d8d5e23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/34099437817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c975b58-739a-4af0-84dd-59ec663b1dd3/how_to_carve_animal_fur.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_7e1747d6f6c1414bb232b37007a2e2ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/nuvutuloruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c909f6-4702-419b-9dff-b1c925c52d48/how_to_add_background_image_to_a_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd3ba26-a895-4556-a6c4-33772b40f730/fofifurexab.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_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 5304 bytes
SHA-256: e21ef3fc6a85bc56713caa05c0842e6bdad9b6408d4573ee07c2ba6c572219d0
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 10172 bytes
SHA-256: 1090feb28c40535f7db9ca39edec749b86faed60f57952f574963aede37a534f

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