Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e96780b7ed56609…

MALICIOUS

PDF

61.3 KB Created: 2020-11-14 06:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 07cca0c9de85091c73a184ee555e9852 SHA-1: 2cc06b350c60b01b2b0dc97c0f008a9114c46a6f SHA-256: 6e96780b7ed566098b56869d44e2c72a14db7f396b27454cc42d2c6d4df6b140
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains or Weebly-hosted files, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://trafficel.ru/aws?utm_term=bye+bye+love+ukulele+chords+pdf PDF link annotation
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/8171808.pdfIn PDF document text
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/xirubatelodik_tetufak_wuvuzikesar.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/68547487.pdfIn PDF document text
    • https://rilofope.weebly.com/uploads/1/3/4/6/134630674/2276338.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdfIn PDF document text
    • https://tafesexetunikej.weebly.com/uploads/1/3/4/5/134576544/nekazo.pdfIn PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/xorusegutal_jazopi_paboxagebadad.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/9054575.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/8901906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b986c9d7-4e07-4396-aa13-220f521551f5/caixa_de_passaros_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4d8964-2a13-4ea3-87af-4ac09d7d59c8/how_to_paint_citadel_miniatures.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/vaxumabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cf09a0-f64f-4179-adaf-0c062069744d/clone_hero_setlist_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566a608f-c90d-4914-9f80-5e14f9f2c7d3/2632257577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d18421-14b9-479b-a6ab-1070be9bb1ec/chi_square_test_spss_assumptions_violated.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_off0000b47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47A 5448 bytes
SHA-256: f56c9e4d687038552e3ff814f8d95c62b0f3973dd4260796c46adb5a8e53ca65
font_01_sfnt_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 9704 bytes
SHA-256: 871052cb86ae77c4ca4907f714c2041f4426f6833f347bc0bbc811a1be77da95

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