Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8bbfa06c57c0a0…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 15:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 60f3b76f0fc4dc4e21c043e5bbb7ed1e SHA-1: 6d5520a406c24e49fa0d93a085fd1c847fa2c04b SHA-256: cc8bbfa06c57c0a08bb5424df9cb0bec76887b4bc566e8de01f9b31e3b9ad471
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the primary heuristic indicating a 'PDF_SEO_LINK_FARM'. One of the linked URLs, 'https://lozipotod.ru/wb?keyword=chapter%20test%20b%20chemistry%20in%20biology', appears to be a lure for search engine optimization or to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wb?keyword=chapter%20test%20b%20chemistry%20in%20biology PDF link annotation
    • http://tujugebisuxilun.22web.org/asus_rt-ac87u_specs.pdfIn PDF document text
    • http://pubifirona.22web.org/dadovup.pdfIn PDF document text
    • http://dommasters.site/11479321680gdhpc.pdfIn PDF document text
    • http://liketime.fun/lonokuwdhany.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/8396742.pdfIn PDF document text
    • http://vapurese.22web.org/ford_focus_ebony_2003_for_sale.pdfIn PDF document text
    • http://hushseo.online/arecibo_message_answersovmp.pdfIn PDF document text
    • http://kyukty68.xyz/white_hot_kiss_book_series1sz98.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/a389df865777f7.pdfIn PDF document text
    • http://antileqphh.site/space_shooter_mod_apk_unlimited_diamond75qsh.pdfIn PDF document text
    • https://texapusozos.weebly.com/uploads/1/3/1/4/131407592/16aefb09c050e.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/setikizo/eso_vet_bloodroot_forge_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/bracket_new_song.pdfIn PDF document text
    • http://duvojawakupo.rf.gd/how_to_draw_a_hello_kitty_face_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/aiscat_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/boris_cyrulnik_gratuit.pdfIn PDF document text
    • http://dabevejef.rf.gd/high_level_requirements_template.pdfIn PDF document text
    • http://jefusebu.epizy.com/nc_class_b_drivers_license_practice_test.pdfIn PDF document text
    • http://refufigatuzar.epizy.com/excel_vba_format_cell_value_as_text.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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 5496 bytes
SHA-256: 01725dfb1c5a1f4825389cbf5fa87374533225c99fda6fbb82a6a8fd695e3fae
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 11160 bytes
SHA-256: f5468674bea6146509e6a902df67d3b4a1237fedb4ea11c68bfc676dd615e810

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