Malicious PDF — malware analysis report

Static analysis result for SHA-256 19de829ab8991e13…

MALICIOUS

PDF

66.3 KB Created: 2021-05-23 08:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0696c2d484b760cd67838dc9fb5ea3be SHA-1: 2df6bc004831db0623b40edcbda78f607954519c SHA-256: 19de829ab8991e13e62154a5ab6690e9f08b8b0baa1c4f6bec2b04ce9634a6b2
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/suxepukogejagilij.pdf In PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/vitusa_pimugeraw.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/zutarudut-sobuvo-pojejasojusenu.pdfIn PDF document text
    • https://dowebirajosem.weebly.com/uploads/1/3/6/0/136010559/nararujiwavikibipuxu.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/0d7c7459e.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/kikupifogirarimugeru.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/88992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=how%20to%20use%20waveform%20generatorPDF link annotation
    • https://uploads.strikinglycdn.com/files/b3e3cd09-cc77-445c-bf6f-7a8cbfd514a6/ford_3000_tractor_fluid_capacities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70449ed-8a3d-4bea-963f-9522b1755264/20295394741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d92bbe-92f0-46ec-beec-6be8b295688b/felila.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/physics_worksheet_magnetism_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc39a23-ecfa-488c-a68d-ee0a69f25012/best_operating_level_capacity_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2136c9-d275-49d6-b50f-e26d65045a8e/706304225.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/wabesuzaloxumoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26056fb-bbbb-4d7a-adc4-7cec6c91c3da/pobabotitamibulovopoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5539eec-f767-431f-aee1-125ef0d85b05/dilation_geometry_worksheets.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_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 5168 bytes
SHA-256: e91e9fbc08f51a39ee2f95bf0c1d3ed7363e79b23160990f546ce7883a371233
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 10100 bytes
SHA-256: bf6d74ac319554f84db5b1feb4b801363a11ac97ede34ba20aeb2b3c479ba18b

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