Malicious PDF — malware analysis report

Static analysis result for SHA-256 4276bed44bde2bd4…

MALICIOUS

PDF

75.6 KB Created: 2021-05-29 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a771f2baa6070fcccc79d7e927da4654 SHA-1: 1905b9f2ae9af2ef884da9655551536fc0c8576d SHA-256: 4276bed44bde2bd4c368f71d42a3d9c34cdb808522d53d4755abf02812999ff4
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://fokemale.ru/strik?utm_term=what+is+the+best+way+to+grow+okra PDF link annotation
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/mebutijekudinusiges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_600bd71e5379e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fe4f0f10f8fa.pdfIn PDF document text
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/falesifakatomes.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4488339/normal_60afe9c5ec77d.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/cd2c6f884cf5ff9.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/magivisife-lotuxidilibam.pdfIn PDF document text
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/xunajevub.pdfIn PDF document text
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/titoverovunenafed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd273b41bf4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fcbf28380c14.pdfIn PDF document text
    • https://luvisusarav.weebly.com/uploads/1/3/6/0/136011852/359e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_601b507719420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_6032e3c8d3415.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/df4634b0-b017-4e3f-b7dd-aad55b1bac2d/2546957601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea55659-af8b-4022-9fcb-ef7294a8b32f/9098339541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b0bd31-f4a6-44d4-b7d2-adf9b78cd3f7/dr_llaila_afrika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5cc8cf-a69d-42e3-9802-2bb57bb82b17/divine_comedy_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53efda24-a9c0-4355-86c7-327027e74ea2/what_is_a_flow_chart_proof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9e3d89-146c-4932-8134-24603eff42b9/er_verb_conjugation_in_spanish.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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 5324 bytes
SHA-256: d572fde901fc935cd3e3ebf9fe59980a79e63494fc00b69a1fa50c456547e4b3
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 11048 bytes
SHA-256: 17ed8d3844c826c038d927a30d8bffd093f02e4da587f4a8bccdc3e21522af1f

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