Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a19e32c9c6f15c…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 14:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2a8e740b9d6bee7ff17da51248a3c4a SHA-1: 5fc72902c948f6f1dde49dc789d1e46cc4090d55 SHA-256: 44a19e32c9c6f15c1f1f9197d185f49bac7576c942954eb98eab8d4d8c863a14
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 0.9990

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://crophysi.ru/award?keyword=honda+carburetor+tuning+pdf PDF link annotation
    • http://ligugiban.scienceontheweb.net/poemas_de_cesare_pavese.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/hitchhikers_guide_to_the_galaxy_chapter_29_summary.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/31913909504.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/recetas_de_comida_saludable_faciles_y_economicas.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/kinonovolodemubup.pdfIn PDF document text
    • http://felagem.getenjoyment.net/cubs_2020_tv_schedule.pdfIn PDF document text
    • http://sinomefonok.mywebcommunity.org/antipsychotic_drugs_side_effects.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://moxadokikubod.onlinewebshop.net/allium_cepa_var_aggregatum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2030cab5-823d-4d18-89d9-6794237c29d5/why_does_mower_deck_belt_keep_coming_off.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/car_log_book_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a1b4b4-44b2-4ac4-8ae2-b48028a89461/linear_algebra_by_howard_anton_solution_manual.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_fd96d5596e13418ba42a967fa440e860.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/how_to_start_a_football_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41d70f8-3bf6-4abe-9d95-f4ba816b5f31/vupogefufozaxefatejijip.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/71293449524.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/29432949536.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_f774e0b999e34fcc9690c57bcd38cf85.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_791ea3e498fa4bbda12448a422411f81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/outrageous_openness_free.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_6d17dc9335c541b7aaa6d12d0d0001fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/magaliesburg_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/zavafonix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000b905d-1234-43a7-8638-ae56d1f45d80/43515306025.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_84310dcc4d3e418481a4da1befcf2a94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/blue_is_the_warmest_colour_subtitle.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 5096 bytes
SHA-256: e12835752f613ef190e7d0dd63cfc79f7ea7ace47f27b8fcb309c7ce2d9012bc
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 10132 bytes
SHA-256: af2add1a1f66c225d5f3073687d9b4d99f6f7d9f31c67bef471bf0bcf58d8158
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230