Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e16a744289ca990…

MALICIOUS

PDF

76.2 KB Created: 2020-12-17 23:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3bbf45b88bb95697275840dd3a18c24 SHA-1: b0a6d40d4c6bf7aa4ea3015fe283b53112d65931 SHA-256: 3e16a744289ca990994fcc3e09fe49377712b6b3cc31df005066a0ae81ca5f63
274 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including redirection to known malicious infrastructure and brand-impersonation credential phishing. The embedded URLs and the presence of a link farm suggest an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and malicious links strongly indicate a phishing attack, likely using embedded JavaScript for redirection.

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
  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nukubejale.weebly.com/uploads/1/3/4/6/134631684/1170c0e.pdf.
  • 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://ggtraff.ru/123?utm_term=symbols+in+to+kill+a+mockingbird In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fca92bc9309f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5f9cd1b50f534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5fa03794ba9ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fb31ed25c0bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5f8e8bd73fb25.pdfIn PDF document text
    • https://nukubejale.weebly.com/uploads/1/3/4/6/134631684/1170c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5f939b9c20dc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc115d62bbd7406580792b0/t/5fc17dfa4f983757201846ff/1606516219106/papigidilodivuwitixaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd17e732780c533aab1118/1606227944046/juduzetogitede.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51130ea4a794d565ff698/t/5fcae2b0551bdc47e79d6136/1607131825717/38533006775.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeedc7acac6192a855f7d/1606282974150/jeremy_lin_akatsuki_shoes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27b7e60f2895dc1f1e23b/t/5fcf0fd15c8977691e3432d5/1607405521930/19061653422.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf08a98f154499f345dbf/t/5fd170b88185f4776a02330a/1607561402479/super_disco_breakin_sample.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf686a2dd96f5918e741e3/1606379628030/city_green_book_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 5340 bytes
SHA-256: 04bb514608d2766f4e1f618667b1612920888aa6fd7f564477f47411e95072ce
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10528 bytes
SHA-256: a4b34c9e76ba5d6cc684501173e73c3c7110c2e613fad608a91fb1ca3ebdabde
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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