Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a55ac379e864536…

MALICIOUS

PDF

64.1 KB Created: 2020-11-09 17:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4e7999432f46364916590b0095a40ce8 SHA-1: b539de11519f886e49b69cc828f4ca2c116d83ce SHA-256: 1a55ac379e864536a85c6ae0dbd0e151cde1d006b02bebe33b16a816921eba42
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic and ClamAV detection. The document body, though heavily obfuscated, appears to be a lure for a free PDF, suggesting a phishing or social engineering attack. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/aws?keyword=sarah+plain+and+tall+book+free+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f8f576f6f60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5fa0640fee2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f97670c1bbc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f8dd6b428217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f91d6c818a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5f9288072b57c.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/sojuravewi/august_month_current_affairs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/nuestro_idioma_nuestra_herencia.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/um_fernando_pessoa_agostinho_da_silva.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/genesis_1513-14_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/lukil.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/lumiya_star_wars_figure.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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 5256 bytes
SHA-256: 6e26228e76519e73bc768956afa0118bc8bec8c49deff9a9a4166f330742af21
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 9932 bytes
SHA-256: 368c2f48471bcd61a68a707b55df5b64a1da5f2411fa45e14a8e399d77b55cf4