Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde26a6fadc48dff…

MALICIOUS

PDF

87.1 KB Created: 2021-06-05 21:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e150cadb468562675147dd03f8575a5c SHA-1: f285180d5d0a6d5a0184c9b8e0d9974f08e01eb7 SHA-256: cde26a6fadc48dff24f089529c499d9b157d3b39bdce0f941a937044123e8320
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and is part of a link farm on disposable hosting. The embedded URL, 'https://pixomot.ru/pbw?utm_term=100+day+countdown+calendar+pdf', is the primary indicator of a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://pixomot.ru/pbw?utm_term=100+day+countdown+calendar+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4418574/normal_60b5cca3666a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_604bb09a95ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_6044fda530558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6035657824494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369161/normal_5fed16b513ad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5fd05532d59c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_6002f8ee276a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90b3321-a825-4f7d-9ce6-1588645be0b2/ejercicios_funciones_trigonometricas.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417621/35744103273.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/how_to_run_android_apps_on_iphone_without_jailbreak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd535d9-5503-4a42-9b42-a45c6c51cf76/51576452186.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144475992/69993216663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c00d57a-5130-4d63-a55f-51b3d1884331/the_outliers_introduction_summary.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/f/37829010420.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144611550/33881207417.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/primaria_ciclo_escolar_2020_a_2021_calendario_sep_mexico.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/98231489477.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144663432/daridarozokuzilidaxi.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144423537/wufomawowenabujaxubuko.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144618729/moriwejodilosoduzejar.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/importance_of_inductive_and_deductive_reasoning.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_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 5264 bytes
SHA-256: 1ba037dbb788a1106cf4a0890883ada31780d76b8676a419747e6dcba63d5b12
font_01_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 11204 bytes
SHA-256: edf6490c1cf0522fc742405141b32ad26ecb3b967a14ed8cf1eba49820dcb4f0

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