Malicious PDF — malware analysis report

Static analysis result for SHA-256 7763bdc371657ed4…

MALICIOUS

PDF

66.4 KB Created: 2020-11-19 17:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f992616e47b396773259031fc78676c4 SHA-1: d9d5bb0802e3890a14ce54d0603365c0cfd72f28 SHA-256: 7763bdc371657ed4e8dacfa81547ff35f49308f75d9fca039d7ede6c058e2e20
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://trafffi.ru/strik?utm_term=download+internet+explorer+8+windows PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8ee27d102da.pdfIn PDF document text
    • https://sibojigejediwij.weebly.com/uploads/1/3/4/6/134606131/pemogoresamodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f93fb88aea80.pdfIn PDF document text
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/verezot.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/nitovuximalobam-fumaxejezefese-sesovokarov-wuvumowovizi.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/534e96.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/vubutew.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/4cb8178e-0591-437f-8b40-3e835dca74ad/lego_minecraft_mod_by_dantdm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a83308-a1ec-49c1-8eb2-28b628b119c6/28988260282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6bad08-6806-46f6-8721-297daf177d21/23492417693.pdfIn PDF document text
    • https://s3.amazonaws.com/moxekibupuru/2676127498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4d51e1-0173-4bf5-bab5-3d853d498ac4/24163020052.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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 5304 bytes
SHA-256: 691b00ac9f95095d5440d9a73007b24b1619849ddbd37b3ad68b765ff87cf4ac
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 10056 bytes
SHA-256: ae3fdb918a07a8dbf9163c78727dfaacfd3670011770cafe2f4ca5b6ceb4b857

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