Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56ba74e8389ee83…

MALICIOUS

PDF

47.0 KB Created: 2020-11-07 15:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1f5452ee54d99bea79fb029b71a895c5 SHA-1: 0d4d7796f9fa7db885c9df5afd24b547322990b6 SHA-256: a56ba74e8389ee83313b317d6f5842287d8c704dd42fd981ec7e9921086db3fc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm designed to redirect users. One prominent URL, https://traffking.ru/123?keyword=david+hawkins+power+vs+force+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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://traffking.ru/123?keyword=david+hawkins+power+vs+force+pdf In PDF document text
    • https://kovumagamu.weebly.com/uploads/1/3/4/5/134578336/ripam-zokokefenexixi.pdfIn PDF document text
    • https://vorenamu.weebly.com/uploads/1/3/4/2/134265490/330603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zulomilo.files.wordpress.com/2020/11/44114612246.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/aifmd_annex_iv.pdfIn PDF document text
    • https://xajawut.files.wordpress.com/2020/11/savojabanawide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce58b36-e748-465f-9cae-e71c4532d0dd/61319259518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e534166f-3eb4-4ffa-a144-7396201d7839/effective_practices_in_early_childho.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://mopuxupu.files.wordpress.com/2020/11/167740540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9a26c3-86f1-4bfe-8dd4-a85d29983b6a/koxupebonosaxotalidonipa.pdfIn PDF document text
    • https://gobovolupoj.files.wordpress.com/2020/11/dls_2020_mod_barcelona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b571a00e-7f73-448a-b175-7fb6bd572ea1/23895627642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1271d67c-10d4-4c87-8ddb-3009b3efa54c/gilal.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_off0000789b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789B 5424 bytes
SHA-256: 4cd25f53bb8e93d124d6800806b59e6afa10ed05d156ed4695f74ad6a03e06a3
font_01_sfnt_off00008b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2B 10892 bytes
SHA-256: 113726a70623def680b0afb90cf7f0e7a4c00c86887c9377e3cdddaab3fc9a7b