Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5a81d847499b15…

MALICIOUS

PDF

66.4 KB Created: 2021-02-22 15:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 92c1b73e987158eb47a42a871d87b29b SHA-1: 5a3517bc2abf7c98ea3c447615b413e82178a7d5 SHA-256: be5a81d847499b15ba6c8376bb382932a4c4ef3938e8fbb8e33a20c695b40a14
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=angle+addition+practice+worksheet In PDF document text
    • https://jakigirizog.weebly.com/uploads/1/3/1/4/131453624/6137458.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/tarar-sisol.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/eszykmu/cookie_crush_match_3_game.pdfIn PDF document text
    • https://pizijejubuga.weebly.com/uploads/1/3/4/8/134883891/dikodeza.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/1924342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovebosovu.rf.gd/wewaj.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/manualidades_faciles_de_hacer_con_reciclaje.pdfIn PDF document text
    • http://majerowi.epizy.com/dyson_v6_absolute_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/damuxoxawati.pdfIn PDF document text
    • http://sejojoxo.epizy.com/my_hp_photosmart_5520_will_not_print_black.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/real_estate_brokerage_agreement.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 5480 bytes
SHA-256: 37d00c6d1d481d2529f0a5406cf7179d77b257dbb7c96f7e5a0b5e578e1127c8
font_01_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 9336 bytes
SHA-256: 3d3b665da3ff1abaff9d79fb473dea614e529735c5bedf8901614ac06dd79dd3
font_02_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd