Malicious PDF — malware analysis report

Static analysis result for SHA-256 120597a51dc8167e…

MALICIOUS

PDF

76.5 KB Created: 2021-01-24 19:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 09b3537607cd21b4aafb17d315ffe5f6 SHA-1: de22ba02235cc150ed022c5a99dee5a6fc776301 SHA-256: 120597a51dc8167eee30329df35105b8d550caa06b65d727930ca45a133376f3
214 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it contains numerous links to potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing or malware hosting sites.

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 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.
  • 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://traffine.ru/123?utm_term=everyman+play+pdf In PDF document text
    • https://dupazenulejafu.weebly.com/uploads/1/3/4/3/134331878/247061.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/podivubolugomizid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5fdfbd8b38a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_6000a5c3a6e03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807618786c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ff411b78da47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fe3a7059c6c5.pdfIn PDF document text
    • https://piwevowukitibe.weebly.com/uploads/1/3/1/4/131454699/8964347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fcf43e67fb7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5fca27d63a5e7.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/jagesedo-jemosebuwej-dimovizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_5fd9e8c4450bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5fe04b1900e18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zepurudevivo.rf.gd/cooling_sheets_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/persona_3_hierophant_social_link_guide.pdfIn PDF document text
    • http://ripifozuj.rf.gd/bodak_yellow_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/dajumufex.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 5128 bytes
SHA-256: ec3b3fa3317bfebcaf0016ecea57700ebc4b0e5da0a0f14bd7c3f6a4c93ef465
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 11580 bytes
SHA-256: 15d947cbe5ccac9b7fd41f8f5468bdf106f45d765143fc43a23e10adf06d32d0

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