Malicious PDF — malware analysis report

Static analysis result for SHA-256 966fda00af4fb130…

MALICIOUS

PDF

55.8 KB Created: 2020-09-30 23:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de79b9e2e6f07aab766342ae6c740f91 SHA-1: eca08aed424d5e8bb1a55fe5fb59248de7a5e0d8 SHA-256: 966fda00af4fb13040effe86d77a0c7cb7b006718d85aaafa382a153d8dc783f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure. The primary link directs to a known malicious redirector, suggesting the document is designed to lure users to malicious websites. 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://cctraff.ru/strik?keyword=acute+urinary+retention+management+pdf In PDF document text
    • http://files.mistoyo.com/uploads/1/3/0/7/130775403/290936.pdfIn PDF document text
    • http://files.peggyshobbies.com/uploads/1/3/0/8/130874326/82332.pdfIn PDF document text
    • http://files.ianlong.org/uploads/1/3/0/7/130740164/komaxelerufoxom-jafomifunefa-xipafixox.pdfIn PDF document text
    • http://files.cherylblackford.com/uploads/1/3/0/8/130813898/4157698.pdfIn PDF document text
    • http://misoxewug.irminenschaft.org/uploads/1/3/1/3/131398140/budibafuvufamij.pdfIn PDF document text
    • http://files.alexandriaponce.org/uploads/1/3/1/8/131871488/8701542.pdfIn PDF document text
    • http://lixakekin.strategieswork.com/uploads/1/3/1/1/131163667/jokovafixasorofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f2667db0-0add-4082-9c4b-50b6b9f58f5f/48363141085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eff01b-03ce-4970-8bee-05ec8de54039/bokulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fb49df-f486-442b-aadf-e4bdbdb1c5a7/momiged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8649fa3-3417-4391-a6ee-a915a4476ca3/rakefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13285625-a167-4cbb-9a0d-0b4fbb9e54ac/20997702805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613bb43c-9d94-4362-813d-a9ba6938d646/13136834884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95615501-373d-4f5e-8d19-cd24a6694125/rofinifabusefidajupuva.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_off000087ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AC 5240 bytes
SHA-256: 988ca00c9be6c10073a5b70e1e742a70aa2219c98220a44857d628a486907b3c
font_01_sfnt_off00009971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9971 13292 bytes
SHA-256: fd6456ed6f9ec5f864db118566a97ca885491031bd87a91a45209796ace9fb55
font_02_sfnt_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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