Malicious PDF — malware analysis report

Static analysis result for SHA-256 31279c50abb8f04a…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 06:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0ddc775824a73848774fe21c040da60 SHA-1: 15dcce38efa9a986bcac9dacefc2f4719e128022 SHA-256: 31279c50abb8f04ade1e1daa54cdb6fe1e614ed321725ede3d2c0dd76654c0ce
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=2006+chevy+malibu+power+steering+problems'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests a phishing or malware delivery attempt, aligning with the Spearphishing Attachment technique.

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://crophysi.ru/123?utm_term=2006+chevy+malibu+power+steering+problems In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fde5965bc608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_5fda8fd9bf53b.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/ed4fb7b6a291.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/8250609.pdfIn PDF document text
    • http://vaxuzorokolate.iblogger.org/tenezoso.pdfIn PDF document text
    • http://tujozavido.66ghz.com/nickelodeon_application_form_2019.pdfIn PDF document text
    • http://hookup157.fun/khan_academy_respuestas2g9qj.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/graph_paper_template_a3tjfgj.pdfIn PDF document text
    • http://roflan.site/rimepamogediwatowm6rfs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fccd2b9d2e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixutixiziv.epizy.com/turn_based_rpg_android_2019.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/guideposts_writing_contest_2019.pdfIn PDF document text
    • http://burafidofa.epizy.com/61349617920.pdfIn PDF document text
    • http://tovedutineve.rf.gd/bonilovet.pdfIn PDF document text
    • http://konemuga.epizy.com/11101352020.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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 6072 bytes
SHA-256: feacfdeedbdeef1b3dfb66dff8c797e463bdad9c1f295b2be1d9563408b37273
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10152 bytes
SHA-256: d13a23c13f533c1ee801a244cabd995bbcc501b95738afc684b59e62673147ad

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