Malicious PDF — malware analysis report

Static analysis result for SHA-256 897544a8a4fdaec7…

MALICIOUS

PDF

72.8 KB Created: 2020-12-02 23:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a981a4321b614837cdbd304cf21fb657 SHA-1: 1a667d0b23b11516d44530d626286bb886802b7b SHA-256: 897544a8a4fdaec76d12c1d4eb8028e9eb5f67bd92592f967e0187292d4fea49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://traffine.ru/strik?utm_term=bird+island+nc+weather PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fc0992cc0683.pdfIn PDF document text
    • https://lizapomed.weebly.com/uploads/1/3/4/5/134511268/pujiferiruxo.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/9451136.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/wutaxe.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/1569653.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/fejokovugoze-vuzanara-gobopovo.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/widipumov.pdfIn PDF document text
    • https://tewefoxik.weebly.com/uploads/1/3/4/8/134857012/pilitewaradudod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e925ea4a794d56451110/t/5fc5993061e25426e1f82d05/1606785330461/raghavendra_swamy_mutt_elgin_il.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/better_discord_themes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57bed9955c744b55a54c9/t/5fc757a8a038a451bcebd2fb/1606899625665/jukitasowomikazavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd62985-6b4c-4992-82b6-7143236d5acd/letter_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/26305872120.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 5168 bytes
SHA-256: c7c0ec92b1b88ed7047e888512a6ebe844244f9fd734e998df01a95e025a5035
font_01_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11664 bytes
SHA-256: 641c82f3d697a13a1f873e478d792e8c82e4be798de1f8b6342a638be944714c

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