Malicious PDF — malware analysis report

Static analysis result for SHA-256 893764860a557c1f…

MALICIOUS

PDF

80.2 KB Created: 2021-04-03 20:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c86abafd9ef3e7fb0e1449e1c974627a SHA-1: d4e29c2a737cdbe36d8adadc8329c19d189e1edd SHA-256: 893764860a557c1f4cf19441bc83ec928666bf30257c76ad32d2001ccbcbb756
186 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 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=burger+king+close+to+me+now PDF link annotation
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/22a3a1ea20c9c.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/velorufimaturusav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b80143d43e6e4bbabcc05604e2196ff3.pdf?index=trueIn PDF document text
    • http://xetixeguxiji.epizy.com/auditoria_de_sistemas_de_informao_imoniana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8e907e-5c3c-44c9-af4e-5b2ed6046b9e/wasoxiwafareniwikuxigefil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c33f06-3b3b-45b5-993c-75a47c33ced0/cuentos_de_eva_luna_dos_palabras_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425a595a-da6b-4ac2-9ba8-70b453870db2/atlas_copco_compressors_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee5cd2a-d38e-46b2-88f5-aea2c3c44850/entrepreneurship_final_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380187c5-a4e8-4d6a-8d94-ba25fbc5debd/lifetime_health_textbook_answers_chapter_6.pdfIn PDF document text
    • http://desegovofefapin.rf.gd/rawonapujemilex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9cb852-67f2-4c88-ba81-ea6d00489c01/kipas.pdfIn PDF document text
    • http://vovogejezubu.rf.gd/4546136953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9d61c6-5d6a-45ea-9613-d473b80932c6/denon_avr-s900w_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752020e0-60e1-443c-aa3c-295815e05697/how_to_add_multiple_answers_in_google_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d6ecd6-5ae2-4a86-8b8f-c4bcbb4ddd9f/the_art_of_racing_in_the_rain_book_genre.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_2db1e9af250241b9b6d4a5cf3684680e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c38b06d-e895-4082-9c01-488fdf5a7806/357908653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a0d871-b3c6-44e9-8ab3-cdcb8748c1da/how_to_tie_a_toga_step_by_step.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_edc5030cb64243e285a69f9c6945411c.pdf?index=trueIn PDF document text
    • http://wekijedi.epizy.com/ucc_128_barcode_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20441a90-4d02-46b5-96f1-e85d185e6dcf/12085878486.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 5116 bytes
SHA-256: fd2bee46cd737b51892e6b591af601c527a0d779a9f7e825b07e06614e78962b
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 4856 bytes
SHA-256: 26e389c7021a265230c2e29b30049765ee7e1a63d9f2b61e6de4120a974fd6a4
font_02_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 22916 bytes
SHA-256: 9f9782a703776f1982574fb080988f5dee95e72fbf44f6017d13e903c09deb1a