Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a1d5d8eaae986a…

MALICIOUS

PDF

78.2 KB Created: 2021-02-19 14:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6f9f828c4b1e9fde074a53822be9d827 SHA-1: 4e6fc99f8e59d98f8bbfeccebb14b5e0f24e3d4e SHA-256: f0a1d5d8eaae986a0443d0b256d66deb2b9eb4a47eabcb25258f63941b56a37c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic indicate a strong intent to drive traffic to external resources, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=diferencial+calculo+integral+concepto PDF link annotation
    • http://instapriz.website/tietz_fundamentals_of_clinical_chemistry_and_molecular_diagnostics_7e_free_downloadnw0hv.pdfIn PDF document text
    • https://sonanibiforopo.weebly.com/uploads/1/3/2/7/132710732/37fb8439ff7d.pdfIn PDF document text
    • http://jewakololinifi.22web.org/wivagamiwenisefasu.pdfIn PDF document text
    • http://899themes-demo.ru/45751504485jfhpm.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/hhijfko/dujezubopunewibibile.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hggiXjc/32297088235.pdfIn PDF document text
    • http://copyrightnotices-form.com/kenmore_electric_oven_not_working_but_stove_top_isefs5r.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/iageRid/zogotar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_6027d3818ac6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/11931091359.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/86819788554.pdfIn PDF document text
    • http://wubogijogazerew.epizy.com/kutofisa.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/avc_converter_full_version.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_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 5004 bytes
SHA-256: 7aaad0837b6b695cbc38ab9096f6b650faf1aaebd3ebc825ce427919cbdaeea7
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10976 bytes
SHA-256: 87cdb6b7aae01523745f74119cd6ddb1c0ac568cde3b16b97582fca24553439e

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