Malicious PDF — malware analysis report

Static analysis result for SHA-256 23352fd39815f3c2…

MALICIOUS

PDF

78.0 KB Created: 2021-06-03 08:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af2ca22b977f12859ea4a26ea80f08b7 SHA-1: c3c903754240fb86b39d9c8bc455761d6474e684 SHA-256: 23352fd39815f3c2532a164ffcc66e6fd9656c297b8c8fcfb42989549dd0d901
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://smidgel.ru/pbw?utm_term=quad+lock+wireless+charging+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365656/normal_6001c05163bc3.pdfIn PDF document text
    • https://jatekokem.weebly.com/uploads/1/3/2/8/132814322/dokisetowejebufuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384320/normal_5ffeabcfc6a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_604db180b9d37.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/sujetibizi-turinavuw-sinikorijeli-raxotisupuwesa.pdfIn PDF document text
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/feacc7.pdfIn PDF document text
    • https://wufujaxuwagax.weebly.com/uploads/1/3/4/4/134400484/5692085.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/6069753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5fe4112124da2.pdfIn PDF document text
    • https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/digaf.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/a8bb77dd-75c6-4e84-a070-2cefe400363b/biveber.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/8452973521.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144491244/62802682609.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144528894/convertitore_da_centesimi_a_minuti.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/government_accounting_millan_solution_manual.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420216/cuentos_cortos_de_aventuras_para_nios_de_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8a7928-2758-479e-b96c-e51968141273/bomb_explosion_sound_effect_free_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5872f946-e159-4421-8c2b-3a33f9cd57c2/jowodawulugusip.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_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5476 bytes
SHA-256: 9b7f4dbdbba4ad34ebea171b12de3f3004204869a2f6cfdafa8a2157095956d6
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 11052 bytes
SHA-256: 53da2b41fb002891c1edb64a364563cf3e433cdd13c178761c51e776fb449339

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