Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ad4398b98860d0…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 19:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b82a3ac05c96e440d326830d2e024585 SHA-1: e7f47b1221c8547f97e501347a2df77371855b39 SHA-256: b0ad4398b98860d08572b7527ab5038a0293450a7b79cbb92f1d8e3b765f7ff8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards exploitation for client execution, potentially leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=adobe+scan+pdf+scanner+apk PDF link annotation
    • https://nofojivebot.weebly.com/uploads/1/3/2/7/132740499/dobato.pdfIn PDF document text
    • https://mapetafuje.weebly.com/uploads/1/3/2/7/132741207/perizezuku.pdfIn PDF document text
    • http://fisuwodep.22web.org/93669689733.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagojovo/FiegcrG/bail_information_form.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/ja30jeg/wapapumaxuvamud.pdfIn PDF document text
    • https://jekazaveme.weebly.com/uploads/1/3/4/4/134470158/dugabubalufezavu.pdfIn PDF document text
    • https://cdn.sqhk.co/kefiruge/iFgcgVL/best_price_ninja_coffee_maker.pdfIn PDF document text
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/komanuduwu_xagajabugi_bejedabifiko.pdfIn PDF document text
    • https://zabagogaj.weebly.com/uploads/1/3/5/3/135313674/gixowelatenotetub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudozegiviw.epizy.com/movewira.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_af1e15e3cbde48a8b70d9f4157a4cd9c.pdf?index=trueIn PDF document text
    • http://fafuwite.epizy.com/rbfcu_free_credit_report.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_a16741628cc34bb99094f89d64fa036f.pdf?index=trueIn PDF document text
    • http://tinijev.epizy.com/birthday_invitation_cards_free_s.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_f739767c7d7b45989063925e564f9f48.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_0e7348c3f4de431fa406c879ea674ac1.pdf?index=trueIn 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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5308 bytes
SHA-256: 072d4358933f4d1c147092df9fa901a8b889a1eee9e1cebf20a36f35e1f8b8c6
font_01_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 12004 bytes
SHA-256: 6d035cc6e89367c181fa0ab365a167dce11d1f7c5d6ca16a72564b3552c5b7f5

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