Malicious PDF — malware analysis report

Static analysis result for SHA-256 523caf5ead654b18…

MALICIOUS

PDF

66.6 KB Created: 2021-01-12 11:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0e302c555bd4d779aa22d3fd17674fd6 SHA-1: 7df6f11083b72022a56b9d6a0d4507eca31a2824 SHA-256: 523caf5ead654b18cf21118d93a9a42950d32a843b5e31a10b895e6aa408ec55
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'antichrist movie online' which is used in the malicious URL, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://gettraff.ru/aws?utm_term=antichrist+movie+online In PDF document text
    • https://cdn.sqhk.co/lirotigi/Hhijhef/rurosobidefanolulasa.pdfIn PDF document text
    • https://site-1183131.mozfiles.com/files/1183131/british_council_ielts_preparation.pdfIn PDF document text
    • https://site-1219938.mozfiles.com/files/1219938/hex_color_scheme_blue_green.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd13a85e832e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_5fb516cc4b2a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5eb3c1a8d5.pdfIn PDF document text
    • https://site-1177467.mozfiles.com/files/1177467/sharpen_image_picture_app.pdfIn PDF document text
    • https://site-1178466.mozfiles.com/files/1178466/block_format_request_letter.pdfIn PDF document text
    • https://site-1174856.mozfiles.com/files/1174856/tenilelas.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/gowupuzokowuxes/disney_itinerary_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/epilepsy_guideline_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/94706478322.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_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 4876 bytes
SHA-256: 76d7814f243b5351e08e94fd2fef151e48a4c42c679fed424fb5204fabea2d49
font_01_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 11352 bytes
SHA-256: e0522b66fef01add1c11ac3e426f64f44b92f6e60c83823fc53084f01adb0cec

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